Double cylinder deadbolt. Grade 3 security. Full solid core 1'' diameter round corner dead latch. Adjustable latch. Fits both 2-3/8'' and 2-3/4'' backsets, round corner strike. Keying information: K6: Order case of 6 and all will be keyed the same. No. 665 3CP K6: Polished brass 3) No. 665 5 CP K6: Antique brass (5) No. 665 25D CP K6: Satin chrome (26D) No. 665 15 CP K6: Satin nickel (15)