The Master Lock No. 643D Set Your Own Combination Padlock features a 1-9/16in (40mm) wide metal body for durability. The 1/4in (6mm) diameter shackle is 7/8in (22mm) long and made of nickel plated steel, offering resistance to cutting and sawing. The 4 dial combination security offers keyless convenience. The Limited Lifetime Warranty provides peace of mind from a brand you can trust.