Sentry Supply 650-7528 Concealed Latch Knob Set with Straight Bolt, Cast Zamak, Chrome Plated, Pack of 1 Set Used to replace broken or missing knob sets of concealed latches in 1 in. thick partition doors. For use as a privacy lock in toilet partition stalls Compatible hole diameter: 1-1/4 inch to 1-3/8 inch; Outside diameter of 1-3/4 in. with 2-11/16 in. overall reach Chrome plated finish Zinc alloy (cast zamak) construction This knob set assembles with a push nut that is nestled within the outside portion of the knob set. Note: Assembly is permanent at first attempt