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From the Manufacturer

16-inch Heavy Duty, 120mm Throat F-Clamps - Extremely fast setup, 90% faster than C-Clamps. Simply slide into position and tighten. Made from drop forged, heat treated, nickel chrome plated steel. The screw and handle are copper coated to protect against weld spatter. Available with various throat depths in light, heavy and super duty to meet most welding applications.