This vice allows you to clamp workpieces anywhere in the vice while the jaws stay parallel. The chain drive ensures parallelism and virtually eliminates the racking common in other vices. The vice can be operated using either handle. A spring-loaded lock pin lets you disengage the chain for controlled jaw skewing for slightly out-of-square work. Easy to mount to allow retrofitting and individual widths (distance between screws). The aluminium chain cover must be cut to the required length. For assembly, you require a 38-mm drill bit (1½ inch),. Screw diameter 27 mm, Maximum spacing 425 mm, (restricted by cover), Screw length 410 mm.