The Master Lock No. 4901DLH Biometric Padlock features a 2-7/32in (56mm) wide metal body for durability. The 11/32in (9mm) diameter shackle offers 2in (51mm) vertical clearance and is made of boron alloy, offering maximum resistance to cutting and sawing. The Biometric interface provides the ultimate ease of use and convenience, with no keys to lose or combinations to remember. The padlock supports multiple fingerprints to enable multi-user access. The 1 Year Limited Warranty provides peace of mind from a brand you can trust.