Vises

A vise (American) or vice (British) is a mechanical apparatus used to secure an object to allow work to be performed on it. Vises have two parallel jaws, one fixed and the other movable, threaded in and out by a screw and lever.

An engineer’s vise, also known as a metalworking vise or fitter’s vise, is used to clamp metal instead of wood. It is typically made of cast steel or malleable cast iron. Cheaper vises may be made of brittle cast iron. The jaws are often separate and replaceable, usually engraved with serrated or diamond teeth. Soft jaw covers made of aluminum, lead, or plastic may be used to protect delicate work.
An engineer’s vise is bolted onto the top surface of a workbench, with the face of the fixed jaws just forward of its front edge. The vise may include other features such as a small anvil on the back of its body.

Source: Wikipedia