The Master Lock 646T Set Your Own Combination Padlocks feature a 13/16in (20mm) wide metal body for durability. The 1/8in (3mm) diameter shackle is 11/16in (17mm) long and made of steel, offering resistance to cutting and sawing. The 3 dial combination security offers keyless convenience. The Limited Lifetime Warranty provides peace of mind from a brand you know and can trust.