1-3/8 in. x 4-1/2 in. Thick Solid Brass Lock and Door Reinforcer, 2-1/8 in. Single Bore, 2-3/8 in. BacksetConstructed from solid brass, the Defender Security Solid Brass Lock and Door Reinforcer helps to protect your door from forced entry. It can be used on wood and metal doors with mortise and drive in latches. It also accommodates key in knob lock sets and deadbolts. Designed for single bore doors with a 2 3 8 in. backset Helps protect against a forced entry For use on doors 1 3 8 in. thick that have mortise or drive in latches Solid brass in bright