The Master Lock No. 4D Laminated Padlock features a 1-9/16 in (40mm) wide laminated brass body for maximum strength and corrosion resistance. The 9/32 in (7mm) diameter shackle is 3/4 in (19mm) long and made of hardened steel, offering extra resistance to cutting and sawing. The 4-pin cylinder prevents picking and the dual locking levers provide resistance against prying and hammering. The Limited Lifetime Warranty provides peace of mind from a brand you can trust.