Wilton Classic 400 series c-clamps are ideal for steel fabrication, industrial maintenance and repair operations. Each c-clamp is drop forged and features an ACME rolled spindle with black oxide coating, replaceable Perma-Pads® and a V-grooved anvil for secure holding of all materials. Wilton® C-Clamp, Extra Deep Throat Regular Duty, Series: Classic 400, 2-1/4 in Throat Depth, 0 to 2-1/8 in Clamping Capacity, 9/16 in Screw, V-Grooved Anvil, 3500 lb Clamping Pressure, Forged Steel Body, 8 in L x 4.5 in W x 1.3 in H