Contemporary Deadbolt, Double Cylinder, 2-1/8" Door Prep Solid forged brass Low profile cylinder deadbolt for 2.125" door prep Features 0.5" low profile cylinder projection Deadbolt case is formed of heavy gauged steel for strength; most interior parts are made of solid brass Specially-designed reinforcing strike constructed of high-grade steel 5-pin keying cylinder Accommodates 1.75" thick doors and 2.125" diameter cut outs. Deadbolt kits are available for 2" and 2.25" thick doors. ANSI/BHMA A 156.13 Operational & Security Grade I