Standard Pack = 1 piece(s). Clamp Width = 1 IN; Clamps Per Package = 8; Hex Key Size = 5/16 IN; Holding Force = 4000 lbs; Maximum Holding Force = 4000 lbs; Thickness = 0.375 IN; Thread Length = 0.9 IN; Thread Size = 1/2-13 IN; Total Throw = 0.1 IN; Width Across Flats = 1 IN;