Downtown Square Single-Cylinder Deadbolt, Satin Nickelsignature series, satin nickel finish, downtown, square single cylinder deadbolt with smart key rekeying, grade 1, 6 way round corner adjustable latch fits 2 3 8" & 2 3 4" backsets, ball bearings to prevent drill out, exposed screws, keyed alike in sets of 4, lifetime mechanical warranty, lifetime finish warranty, clear pack. pair with contemporary lever halifax or milan, 50% lower profile than a standard deadbolt.