The Master Lock No. 3D Laminated Padlock features a 1-9/16in (40mm) wide laminated steel body for maximum strength and reliability. The 9/32in (7mm) diameter shackle is 3/4in (19mm) long and made of hardened steel, offering extra resistance to cutting and sawing. The 4-pin cylinder prevents picking and the dual locking ball bearings provide resistance against prying and hammering.