The Master Lock No. 7640704EURD features a 40 mm wide set-your-own combination aluminum padlock with a 110 mm long shackle made of galvanized, hardened steel for strength and corrosion resistance. This lock is suitable for indoor use and is ideal for securing storage units, school, employee, or sports lockers, and toolboxes. The hardened steel shackle and locking loop resist cutting and sawing. The ribbed shackle cover provides additional strength, and the hardened steel locking loop offers high cut resistance. The lock's shackle has a diameter of 6 mm and is made of nickel-plated steel, providing high resistance to cutting and sawing. The security of a 4-digit combination offers keyless convenience. The limited lifetime warranty gives you the assurance of a brand you can trust.