The jaws swivel on two bearings, therby binding the materials around the hook when it rotates - a new principle that makes it easier an faster to tie professional looking files. Our vise can naturally be used for traditional tasks. The vise jaws hold hooks of all sizes completely immovable - the jaws are opened and closed using a cam-arm. It can't get any easier - or better. The jaws are made of top quality, perfectly tempered steel.