With these kits, you can construct a traditional leg vise, a versatile design that combines a large wooden jaw (called a “chop”), a single screw and a broad clamping surface free of guide rods to hold stock in various orientations. The kits come with a Benchcrafted Crisscross, which has scissor-like arms to keep the chop parallel to the leg throughout its travel, eliminating skewing and ensuring full contact with the work. The cast-iron Crisscross supports the heavy chop, taking weight off the screw. This reduces friction and risk of binding, allowing the 1 1/2 lb tommy bar to impart enough momentum that the vise glides closed with just a freehand spin.