Bessey KR3.518 18-inch K-Body REVO Large Parallel Clamps with Handle, 4-Pack Perfect Parallel jaw design for, 90 degree clamping of materials, glue-ups of materials, general purpose clamping of wood, composites, plastics, light metals, and mixed materials 3 3/4" throat depth, with 3 removeable jaws pads designed to protect material surfaces, two rail protector pads designed to keep clamped material from contacting rail surfaces. Rail protector pads snap off when not needed. 1,500 lb clamping force, with ergonomic designed 2 component molded soft grip handle rapid action jaw opeing and closing, simple raise handle away from steel rail and slide moveable jaw to desired point, reverse movabel jaw for spreading cold drawn steel alloy rail with six serrated edges for secure,slip pro0f clamping, K Body REVO clamps sit flusch on work surface for easy set ups