Callan KA2101 Double Cylinder Deadbolt Grade 3- Satin Nickel Double cylinder door handle sets and deadbolts are keyed on both the interior and the exterior, requiring a key to lock or unlock from either side. In some locations, Double Cylinder locks will not pass code due to their hindrance of quick exit during a fire, and as such are not commonly used for residential locations. Features Combination Screws that Suit both Wood or Metal Door Mounting. 200, 000 Cycle Count. Work's Well with both Traditional and Functional Decor. Item Weight - 1.8 lbs. Specifications Door Prep - Entry Cross bore - 2-1/8 in., Edge bore - 1 in., Latch face - 1 x 2-1/4 in. Back set - Fits 2-3/8 in. and 2-3/4 in. Door Thickness - 1-3/8 in. ~ 1-3/4 in. door standard. Latches - Deadbolt - 2-3/8 in. 2-3/4 in. adjustable (9092), Faceplate - 1 x 2-1/4 in. round corner, Bolt - 1 in. throw with hardened steel rod. Strikes - 2-1/4 in. full lip round corner (9113 9117). Door Thickness - 1-3/8 in. ~ 1-3/4 in. door standard. Wood Screws - Combination screws that suit both wood or metal door mounting. Cylinder - KW1 5-pin standard. SC1 5-pin optional Deadbolts packed KA5. Door Handing - Not Required. Finish - Satin Nickel.