The Master Lock Magnum M175LFEC2 Heavy Duty Outdoor Combination Locks features a 2in (51mm) wide zinc body for strength and reliability. The 3/8in (10mm) diameter octagonal shackle is 1-1/2in (38mm) 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. Includes two set your own combination locks, without the need for a reset tool. The Lifetime Guarantee provides peace of mind from a brand you know and can trust. Heavy duty outdoor lock; Maximum security combination lock is best used as a gate lock, shed lock, or storage lock Set your own four digit combination lock for easy combination recall; No combination change tool required Padlock is constructed with a zinc body and reinforced body bumper for strength and reliability; Shackle seal and covered dials for superior weather protection; One directional dial feature for low light applications Tough-Cut octagonal boron-carbide shackle is 50% harder than hardened steel; Roller pin cylinder provides maximum pick and pry resistance 2-1/4 inch (57 millimeter) wide lock body; 3/8 inch (10 millimeter) diameter shackle with 1-1/2 inch (38 millimeter) length, 15/16 inch (24 millimeter) width; Extended shackle for application flexibility Includes two heavy duty set your own combination locks