National C9100 Mail Box Lock with Dust Cover Clockwise Turn Less Cam APPLICATION ヨ Exterior pedestal-mounted neighborhood boxes. Has keyway dust shutter for lock protection. Clip mounted. OPERATION ヨ C9100 operates clockwise. Key removable in locked position only. For counter clockwise operation use C9200. KEYING ヨ Available keyed differently only (2,000 changes). See chart for correct key blank part number. For Codes 1000-1999, 3000-3999 use Key Blank D4300, For Codes 2000-2999, 4000-4999 use key blank D4301. PACKAGING ヨ Includes: a spring clip, mounting nut and (3) keys. Replacement cam part number C7120 available as separate item.