This Residential ANSI Grade 2 Certified, Heavy Duty, Single Cylinder deadbolt features an interlocking tubular chassis, hardened steel anti-saw pin, a case hardened steel drive rod and hardened steel screws to enhance your security. The interior side has a turn piece to operate the bolt while the exterior side requires a key. Utilizing a KW1 keyway ensures that you"ll always be able to get a key made. It fits exterior doors between 1-3/8-Inch and 1-3/4-Inch and the backset is adjustable between 2-3/8-Inch and 3-3/4-Inch. The US15 satin nickel finish is protected by a clear powder coat finish. The excellent craftsmanship is backed by Legend"s Lifetime Mechanical Warranty and a 10 year warranty on the finish.