The Pony Jorgensen Hold-Down Clamp offers the advantage of benchtop and machine-table 'surface' clamping. They are designed to rotate a full 360 degrees around the holding bolt and can be used on any wood or metal surface. This hold down clamp is to be used anywhere on wood or metal surfaces. Specifications: Throat Depth: 1.3/4in.Load Limit: 2000 lbs.Screw Diameter: 9/16in.