The Universal Hardware SIngle Cylinder Deadbolt has a 3-hour UL fire rating and is ANSI Grade 1. It has an internal collar to prevent prying and wrenching and an anti-saw pin in the bolt. The latch has a 1 in. bolt throw.. Exterior needs key and interior has thumb turn. 6-Pin SC4 brass cylinder, includes 2-keys. Full lifetime warranty. Commercial/Residential: Commercial,Residential. Deadbolt Type: Single Cylinder Deadbolt. Door Handing: Universal. Door Lock Style: Classic. Door Locks & Knobs Product Type: Deadbolts. Electronic/Mechanical: Mechanical. Features: Easy Installation. Finish: Satin Chrome. Finish Family: Satin Chrome. Hardware Color Family: Chrome. Included: Installation Instructions. Interior/Exterior: Exterior,Interior. Keyway: SC4. Material: Steel. Security/ANSI Grade: ANSI Grade 1 (Best). Total Number of Keys Included: 2. Deadbolt Bore Hole Diameter (in.): 2.125 in. Deadbolt Cross Bore Diameter (in.): 1 in. Required Door Thickness (in.): 1-3/8 in to 2 in