Last updated: October 15, 2021

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Welcome to this issue of ReviewBox. This time you will find exclusive information about the best spanners. Those tough and useful tools, indispensable for tightening or loosening nuts and bolts. Read on and find useful facts that will help you when buying.

We say they are tough, because they are mostly made of stainless steel. A material famous for its durability, beautiful appearance and excellent properties, which stand the test of time. In fact, it allows the faucets to be immune against corrosion, thus extending their life span.

If you are thinking of buying faucets, it is essential that you pay as much attention as possible to this information we have compiled for you. That way, you will know which are the best and in which cases you should use each one.

Our contribution will allow you to make the best investment, the main objective in any purchase.


  • Spanners are metal tools used in tasks that require the impression of force on parts. They are very useful for occasional maintenance work around the house, and indispensable in industrial activities such as mechanics.
  • Nowadays you can buy fixed, adjustable and Allen spanners. The former are not adjustable, unlike the latter. The Allen type wrenches have a ball or hexagonal head, designed to be inserted into special screws.
  • A detailed evaluation of the purchase criteria is essential to choose the best spanners. You need to know what they are made of, their tightening capacity, the material of their handle and their size.

The best Keys: Our Picks

Buying Guide

Do you know how to choose the right keys? This can be a complicated process that requires a certain amount of knowledge. As they are multi-purpose devices, it is worth asking yourself which ones are the most versatile, in order to cover a variety of purposes. So we made this buying guide to help you in your choice.

Wrenches are useful in any working environment. (photo: Luca Bertolli /

What are spanners and what are their advantages?

Wrenches are hand-held items designed to tighten or loosen round-headed or hexagonal nuts and bolts. They also extend the life span of these parts because they do not wear out during industrial, mechanical, commercial and domestic work.

In every toolbox there should be a set of spanners that allow a person to perform manual twisting movements. Why? In addition to nuts and bolts, wrenches are also required for cylindrical surfaces, threads and large bolts or screws.

This is not to mention emergency uses.

At any time in our lives we will need a set of spanners. As it is quite likely that you will have to lead a situation where you will require these materials, we recommend you to know what are the most important details linked to the spanners in your instrument box.

  • Made of resistant materials
  • Some have ergonomic handles
  • Unscrew nuts and bolts
  • Adjustable tools
  • Available in different sizes and dimensions
  • Some are large
  • Some are heavy to use
  • Low quality versions are available on the market
  • They take up considerable space

Wrenches or Allen spanners - What should I pay attention to?

Depending on how you will use your spanner set, you should choose between these two types. In order to make the right choice, ask yourself, which one do you need? Having the right tool in your hands is key. Otherwise you won't be able to get the results you expect during your work.

Having the spanner set that fits the parts extends their lifespan and makes your work easier. This way you won't have to exert additional pressure on them to tighten or loosen them. Continue here and find out more about those little details that will make the difference in your purchase.

Wrenches. There are different models of wrenches. You'll find large, small, adjustable and tuned wrenches. In any case, they all serve to manoeuvre nuts and bolts in a specific place, ensuring a comfortable process for the user.

Having the right spanners in your hands will get you out of trouble. So they should never be missing in the areas where you stay, such as at home or at work. We also suggest having good keys in your car, so that when unforeseen events occur on the road, you have the opportunity to solve them yourself.

Allen keys. Unlike the previous case, these have a design that is especially suitable for screws that are difficult to access. This is because their spherical or hexagon-shaped head allows them to be tilted at an angle of up to 25 degrees. But they also have a long arm that enters the hollow head of the part.

These spanners are used to protect the industrial safety of a workshop, whether it is a carpentry, furniture or mechanic workshop. They are also known individually as Allen spanners, devised in the 20th century for headless fasteners. They are also used in the manufacture of vehicles, aircraft, submarines and tanks.

Wrenches Ball-head spanners
Price Moderate-High Moderate-High
Adaptability Assured Only on certain parts
Strength Moederate-High High
Models Various Single model
Functions Various Specific

Buying criteria: factors that allow you to buy and rate different types of spanners

Here is some interesting content to help you learn more about the small but important elements to consider before buying spanners. Read them in detail, remembering that each one will help you choose the best option and, therefore, make a good investment

  • Materials of construction
  • Adjustment capacity
  • Handle
  • Size

Manufacturing materials

One of the elements that determine the quality and durability of any tool are the materials from which it is made. Broadly speaking, spanners are made of two components that may not seem so different from each other. However, you will see below that the difference is important.

Steel. Spanners are generally made of steel, due to its strength and hardness. Make sure they contain a small layer of chrome to help prevent corrosion of the metal. However, if the steel starts to rust, the hygiene and lifespan of your tool will be reduced.

Stainless steel. It is the best material to use for the spanner you want to buy, and in general for any instrument. Its cost is higher compared to common steel, but it resists the effects of corrosion and different temperatures, and it also looks very good.


One of the qualities by which spanners differ is their adjustability. You will have to choose one over the other depending on the job you want to do when you want to buy a versatile tool. Find out in which cases each one is more suitable for you.

Fixed. These tools are used to tighten or loosen screws whose head exactly matches the shape and size of the spanner so you will need several pieces. If you will be doing very specialised activities that require precision, buying an open-end spanner is the best option for you.

Adjustable. This model of spanner can adjust its movable jaws according to the size of the item you want to tighten or loosen. It is very versatile, because with just one wrench you can perform all the functions of different spanners. This is the model you need if you don't want to mess around with different tools.


The handle is one of the most important areas of any spanner, because that is where you will place your hand and exert the necessary pressure. That's why it shouldn't deteriorate easily. To choose the best type of handle, consider the place where you will be working with your tool, as well as the person who will be using it.

Without rubber. These handles are made of the same material as the rest of the spanner. Therefore, their resistance is decisive, as is their hardness. It is ideal if you frequently work in mechanics and other similar tasks that require a reliable instrument, capable of being preserved over time.

Rubberised. This type of handle has a special surface that does not damage the user's hands. On the other hand, it is also less resistant, as the rubber is not as strong as steel. If you need an occasional tool for working at home, choose this presentation. You will take care of your hands and those of your family.


Your spanner will be a useful tool as long as the size of its mouth matches the size of the nut or bolt you need to tighten or loosen. As you can imagine, there are different sizes, although in some areas there are more or less standard sizes. We can summarise them in three, know the most common for each case.

Small (between 7 and 11 millimetres). These spanners are suitable for work in very specific areas that require enormous precision. For example, the maintenance of electronic devices. If you work with this type of equipment, with parts and adjustments of unusual proportions, choosing a spanner set with these dimensions is your best alternative.

Medium (between 12 and 15 millimetres). You could call this the standard size for household work. They don't take up much space, so you can store them anywhere. If you want to equip yourself with the necessary tools to solve any eventuality, then buy spanners between 12 and 15 millimetres in diameter.

Large (between 18 and 23 millimetres). Necessary for large nuts and bolts used in construction or mechanics. They take up a lot of space, so you will need a special place to store them, such as a toolbox. If your hobbies include these activities, buy spanners with wide openings from 18 to 23 millimetres.

(Featured image photo: Kurjan/