The Universal Hardware Single Cylinder Deadbolt lock is designed for interior or exterior doors where security is top of mind. The inside locks and unlocks the deadbolt using a thumbturn and the outside locks and unlocks with a key. The deadbolt is equipped with a 6-Pin SC4 brass cylinder, saw resistant bolt and metal collar to resist prying and wrenching from intruders. It's made to fit wood or metal doors 1-3/8 in. to 2 in. thick and has an adjustable latch that fits a 2-3/8 in. or 2-3/4 in. backset. The Single Cylinder Deadbolt is also ANSI Grade 1 and tested to exceed 250,000 cycles and has a 3-hours fire rating (UL Listed) for commercial use. A square corner strike plate, 2 keys, mounting hardware and installation instructions are included.