For indoor and outdoor use; Padlock with key is best used for backpacks, briefcases, tackle boxes, lockers and storage locks.Note: Measure your door's backset, cross bore and thickness to ensure you find the right fit. Keyed padlock features a durable solid brass body to resist corrosion and a hardened steel shackle for cut resistance 4-pin cylinder and dual locking lever mechanism provides pick and pry resistance 1-9/16 in. (40 mm) wide lock body; 1/4 in. (6 mm) diameter shackle with 7/8 in. (22 mm) length, 13/16 in. (21 mm) width Includes one padlocks, two keys; same key opens all four locks