Once attached to a bench or fixture, this clamp is simple to use and ideal for light-duty applications. With up to 150 pounds of clamping pressure, it works great as a quick-action hold-down clamp for jigs or for keeping workpieces in place. Bottom of rubber clamp foot adjusts from level with mounting surface to 7/16" below mounting surface. Total length with arm extended: 2-5/16". Length of arm only extended: 1-1/4" Mounting plate is 1" W x 1-1/16" L.