The CRL Keymatic Cam Lock for Doors and Drawers up to 5/8" (16 mm) thick has the Keymatic Multi-Combination Cylinder. The polished nickel finish Lock comes with a spur washer for mounting in wood doors and drawers, two number one Combination Keys (Cat. No. KMK1), and one Master Combination Change Key (Cat. No. KMKM). Keys for other combinations (Cat. No. KMK2-KMK8) must be ordered separately. Requires 3/4" (19 mm) diameter hole. For instructions on keys and combinations.