The Master Lock 1D Laminated Padlock features a 1.75' (44mm) wide laminated steel body for maximum strength and reliability. The 5/16' (8mm) diameter shackle is 15/16' (24mm) 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. The Limited Lifetime Warranty provides peace of mind from a brand you can trust.