These Leigh Bench hold down clamps use the same cam-action technology developed for the clamps found on Leigh's legendary dovetail jigs. With a thickness capacity of 0"-3" and throat depth of 2-3/4", you’ll find these clamps useful for bench work, drill press hold downs and a wide array of jig applications. Tough, glass-filled nylon cam-action clamp handles are easy on the hands and lock with a quick 90 deg. action. Rugged, aluminum alloy clamping leg is rigid & strong and has non-marring pads on the toe and heel. The Bench style clamp mounts quickly in any bench hole from 7/16" to 1-1/8" and in bench tops up to 4-1/4" thick. A speed nut quickly engages the 7/16" threaded rod underneath your bench, securing the clamp. A brass nut w/ collar bushes the rod snugly into 3/4 & 1" holes and 2 included fender washers let you mount into larger diameter holes or square dog holes.