The Master Lock 510D laminated padlock with key features a 1-3/4 in. (44 mm) wide laminated steel body for strength and reliability. The 9/32 in. (7 mm) diameter shackle can be adjusted from 5/8 in. (16 mm) to 2 in. (51 mm) long for application flexibility; and is made of steel, offering strong resistance to cutting. The warded single locking lever mechanism minimizes jamming from dirt and grime. The lifetime guarantee provides peace of mind from a brand you know and can trust.