Our clamps feature strong cast iron frames and a screw-thread mechanism that provides a sturdy grip. Additional Info: Cast Iron C-Clamp, 4" Jaw Opening Package Size(L x W x H): 8 X 4 X 1 (IN) Categories: Clamps, C-Clamp HTS Code: 8205.70.0090 UNSPSC: 2.71121e+007 Country Of Origin: INDIA