Jimmy-Resistant Deadlock, Diecast, Brass Color, Angle Strike, Single CylinderThe Defender Security Painted Brass Jimmy Resistant Single Cylinder Entry Door Deadlock is designed to lock the door to the jamb to prevent a forced entry. It consists of a 5 pin tumbler cylinder and includes a tamper proof shutter guard. California residents see Prop 65 WARNINGS Used to prohibit forced entry by spreading of door frames Installs on doors from 1 3 8 in. to 2 3 8 in. thick with a 2 9 32 in. backset Ideal as a replacement lock cylinder