Sentry Supply 650-8759 ADA Knob Set, Chrome This hardware is used to replace broken or missing knob sets of Concealed latches. Privacy lock for toilet partition stalls Outside diameter of 1-5/8 in. With 2-9/16 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