B60 Grade 1 Residential Deadbolt. Key cylinder outside, thumb turn inside. Latch face: 1" x 2-1/4", round or square corner face plate, 7/8" housing dia, 1" throw. Adjustable Backset: 2-3/8" or 2-3/4". Rounded housing helps prevent sledge hammer break-ins. Dia: 2-1/2", Proj: 11/16", Cross Bore: 1-1/2" or 2-1/8" Edgebore: 1", Strike plate: 1-1/8" x 2-3/4". Box Packs.