- Strap wrench
Many strap wrenches have built-in handles. Others are made to receive the square drive of a ratchet wrench.
The strap or chain can have various forms. Some straps are made of polymers, and are smooth, highly flexible, non-marring, high-friction straps. (Before the era of commercial polymers, the straps were of leather or rubber.) Other straps are bands of spring steel, moderately flexible, slightly firmer and more likely to mar than the polymer variants. The chains tend to be of the roller chain type (like a bicycle chain).
Many oil-filter wrenches are of the strap type. Others are of the socket type or the pliers type.
Chain whips (e.g., for bicycle work)
A chain whip is a tool used to tighten and loosen threaded sprockets on a bicycle. (It is similar in form to a weapon of the same name.) It is called a chain whip because it has a short section of chain used to grip the sprocket. An alternative method to tighten sprockets is the rotafix method, which uses no tools.
Piston-ring compressors are strap wrenches that evenly squeeze (compress) the piston rings around a piston long enough to slide it into a cylinder. They look a lot like an oil-filter wrench of the strap type.
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