These wrenches are commonly used in plumbing to assemble or loosen pipes without flat sides. These products come with serrated jaws to improve grip on round pipes. These normally do not work well on flat sided fasteners and other types of fasteners.
These types of wrenches are capable of gripping fasteners through a chain or strap being pulled in tension around them. The tension firmly grips objects of any kind. Their high static friction prevents the fasteners from slipping.
These types are capable of adjusting in terms of size to accommodate different assortments of nuts and bolts. Their versatility makes them slide and slip along objects particularly when too much force is applied.
Their ratcheting mechanism allows you to make the most of every swing, especially in confined spaces. It also allows you to loosen or tighten the bolts and nuts with a reciprocating motion without refitting or removing the tool after each turn.
How to Buy the Right One?
Look for the Cr-V mark
This mark means that chromium (Cr) was added to the material to make the tool corrosion and rust resistant. It also means that vanadium (V) was added to improve strength.
Choose offset types
Choose models designed with an offset at the box end. Also, you should choose tools with the level of the handle above that of the box or ring to avoid possible slipping when more force is applied to the tool.
Look for full contact
The sides of the opening of any tool you choose should make full contact with flat sides of bolts and nuts. You should avoid models with too short openings as they round off the fastener corners making it difficult for you to loosen it.
Buy them in sets
It makes sense to buy these tools in sets. A set is not only cost effective, but it will also cover almost any size bolts, nuts, and pipes you are likely to encounter