Clamping Kit: Clamping Kit: 52/58 PCS Clamping Kits Set with metal holders. Heat treated steel with a black oxide finish. Supplied in storage rack which can be wall mounted. 50PCS Clamping Kit:Metric Size: M10, M12, M14, M16 and M18Inch Size: 3/8", 7/16", 9/16", 1/2", 5/8", 3/4" Clamping Kit