REPLACE OLD OR BROKEN DOOR LOCKS – When your sliding door mortise lock is broken or old, don’t replace the door entirely, just get a new Prime-Line E 2187 Mortise Lock! FOR SLIDING DOORS – This Mortise Lock can be used on sliding patio doors constructed of wood, aluminum and vinyl. Also fits doors using W&F manufactured handles. EASY INSTALLATION – Installation is quick and easy – working sliding door locks are well within reach. Mounting Flanges have 6-32 tapped thread. 45 DEGREE KEYWAY - This E 2187 mortise lock has a 45-degree angled keyway position when in the locked position. PRODUCT INFO - The mounting hole centers of this lock measures 3-11/16” from center to center, and the rear housing corners are square. Mortise lock dimensions are: 1.125 inch(D)x0.5 inch(W)x3.688 inch(H).