Wilton — 540A Series C-Clamp 0 - 4” Opening CapacityWL9 22003 540A 4, 540A Series C Clamp 0 4 Opening Capacity 540A Series Carriage C Clamps are ideal for light industrial, woodworking and repair applications. They feature a black oxide coating, oscillating head, and sliding cross pin handle. Frames made from high strength ductile iron castings Sliding pin (vise type) handle, single acme thread rolled spindle and oscillating ball and socket tip Wilton's heaviest duty carriage clamp available