Plate Clamp, Working Load Limit 4,000 lb, Attachment Type Load Ring, Open Type Manual, Close Type Manual with Lock, Minimum Material Thickness 0 in, Maximum Material Thickness 1 in, Minimum Jaw Opening 0 in, Maximum Jaw Opening 1 in, Material Steel, Clamp Type Plate Clamp, Operation Vertical Lift, Attachment Diameter 3 5/8 in, Grip Type Teeth, Overall Height 16 3/8 in, Overall Width 3 3/8 in, Overall Depth 6 3/4 in, Standards ASME BTH-1 Clamp is equipped with a safety mechanism, ensuring the clamp does not slip when lifting force is applied and when load is being lowered. 300% overload factory tested.