Locks fit all standard piercings. Can be installed in minutes on right- or left-hinged locker doors. Secure 5-pin tumbler mechanism. Hard-wrought steel case and cadmium inner parts are rustproofed. Cylinder is precision-machined. Locks include 2 embossed brass keys, 2 case-hardened unslotted bolts, and 2 "kep" nuts. Can be master keyed for an extra charge. Locks are normally furnished so that key is removable in the locked position only. MASTER KEYED LOCKS ARE MADE TO ORDER AND CANNOT BE RETURNED.