Wright Tool Construction/Structural Wrench, Measurement System: Imperial, Box End Wrench, 2-3/8 in Wrench Opening, 12 Points, 28 in Overall Length, 3-11/16 in Offset, 3-23/32 in Box End Width, 1-5/8 in Box End Thickness, Spud/Rat Tail Handle, Steel, Black Oxide.