The Master Lock No. 1590D Set Your Own LETTER/NUMBER Combination Padlock features a 1-15/16in (49mm) wide metal body for durability. The 1/4in (6mm) diameter shackle is 7/8in (22mm) long and made of hardened steel, offering extra resistance to cutting and sawing. The patented dial technology operates with familiar right-left-right combination lock movement. The locking mechanism features anti-shim technology, offering maximum security. The Limited Lifetime Warranty provides peace of mind from a brand you can trust.