The Master Lock Magnum no. M175XDLJ solid body padlock features a 2in (51mm) wide zinc body for strength and reliability. The 3/8in (10mm) diameter octagonal shackle is 2-1/2in (64mm) long and made of tough-cut boron-carbide, 50% harder than hardened steel, offering maximum resistance to cutting and sawing. The roller pin cylinder provides maximum pick and pry resistance. The hinged dial cover and shackle seal offers superior weather protection, and reinforced body bumper protects against scratches. The lock includes set your own combination convenience, without the need for a reset tool. The lifetime guarantee provides peace of mind from a brand you can trust. Magnum the no 1 choice of professionals Tough-Cut octagonal boron-carbide shackle is 50% harder than hardened steel 2-1/2in (64mm) shackle clearance for more uses 2in (51mm) wide zinc body with reinforced body bumper for scratch resistance Roller pin locking for maximum pick and pry resistance Shackle seal and hinged dial cover for superior weather resistance Set your own combination convenience, no reset tool needed One directional dial feature for low light applications Lifetime guarantee