Padlock application: for indoor and outdoor use; laminated steel padlock is best used for storage units, sheds, Garages, fences and more. Dual-armor protection: small padlock has a laminated steel core for strength surrounded by stainless steel & zinc outer components for weather resistance. Very high security application: lock has a 4-pin cylinder for increased pick resistance and a tough-cut octagonal boron-carbide shackle that is 50% harder than hardened steel. Durable design: laminated steel lock has dual ball bearing locking for maximum Pry resistance and a reinforced body bumper for scratch resistance. Specifications: (H x W x D) 9.1 x 5.2 x 3.1 cm; shackle (H x W x D) 3.8 x 2.4 x 0.9 cm; 3 keyed alike Padlocks; 4 keys., Weight: 2.46476808916 pounds, Manufacturer: Master Lock