As part of the Legend ANSI Grade 2 certified Contractor Series, this heavy duty, Commercial quality Single Cylinder deadbolt proves a positive deterrent to forced entries. Security features include a full 1-Inch throw deadbolt, hardened steel roller insert and tailpiece, a pressure cast security insert and a solid brass 6-pin tumbler cylinder and housing. This deadbolt has a UL listed 2-3/8-Inch backset latch, a 1-1/2-Inch door bore and an adapter ring for 2-1/8-Inch holes. Includes 2 SC1 keys. The excellent craftsmanship is backed by Legend"s Lifetime Mechanical Warranty and a 10 year warranty on the US3 polished brass finish.