C-Clamp, 6-1/4", Steel, Extra HD, 27, 500 lb.Mfr #: 6 FC Clamping force ranging up to 27,500 pounds Black oxide coated spindle resists corrosion Square spindle head stands up to heavy wrench tightening use, including both hand and torque wrench Full length spindle is machined from a single piece of square, cold drawn steel, hardened and tempered Ideal for heavy construction, bridge building, heavy fabrication, and ship building Backed by Wilton's industry leading lifetime warranty against