Veritas Twin Screw Vice
This is the only non-racking full-width end vise on the market. You can clamp anything anywhere in the vise and the jaws stay parallel.
The chain drive ensures parallelism and eliminates the racking common in other vises. It can be operated using either handle.
Even better; a spring-loaded lock pin lets you disengage the chain for controlled jaw skewing needed to equalize pressure on slightly out-of-square work. Rows of dog holes in the bench top and the side skirts give you clamping capacity equal to the length of your bench plus 12inch (the clamping capacity of the vise). This lets you clamp pieces horizontally or vertically.
To build the vise; you will require two hardwood jaws. The vise is an easy retrofit to an existing bench; requiring only the addition of two pieces: an end cap drilled for the vise nuts and fixing bolts; plus the vise jaw itself.
As a result of customer feedback; Veritas have changed from a plastic to an aluminum chain cover consisting of two cast end caps and a bridging extrusion. However, unlike its predecessor, the cover is not telescoping and must be cut to length for mounting at other than the maximum spacing.
The new standard vise accommodates vise screw centers up to 16-7/8" (428mm). The two vise screws, nuts, chain cover, wooden handles and all installation hardware are included with complete mounting instructions. A 1-1/2" bit is needed to drill four holes.