Visual pack. B-series single cylinder deadbolt for exterior doors. Grade 1 security. Features new Snap-And-Stay hands-free installation. Deadbolt locked or unlocked by key from exterior or by interior turn piece. Dual option latch includes: 1/4" round corner and 1" circular drive-in latch, adjustable for 2-3/8" or 2-3/4" backsets. Strike: 1/4" round corner full-lip strike. Meets BMHA Grade 1 security requirements. hardened steel pin in latch bolt provides added protection against sawing attack. 1" door preparation required for latch bolt while 2-1/8" required for deadbolt cross bore. Keyed alike in multiples of 4. Order full case of 4 for keyed alike cylinders. Lifetime mechanical warranty.