The Wilton Carriage C-Clamp provides the maximum depth for jobs that require increased throat capacity. The clamp features a ductile iron frame designed for maximum clamping pressure. The clamp is ideal for light industrial, home craftsman, woodworking and repair. ADDITIONAL SPECIFICATIONS: Nominal Opening Capacity: 0 - 1-1/2"; Throat Depth: 1-1/2"; Clamp Pressure: 820 lbs.; Spindle Size: 5/16"