Olympus small pin national keyway drawer lock. Easily re-keyable via set screw cylinder release mechanism. Tested to ANSI/BHMA A156.11 Grade 1 cycle testing. Withstood in excess of 40,000 cycles with no damage. All other requirements of ANSI/BHMA A 156.11, no less than Grade 2 performance was attained. Zinc die cast lock body. Solid brass pin tumbler cylinder. Barrel diameter: 7/8". 15/16 inch cylinder length. Includes: 56-1 bar strike. Finish: 26D. Keyway: National D4291 (4 pin). Stock keying: KD/KA - 4 pin standard. Keyblank 4-pin: KBN-4-NP.