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Built-In Combination Lock Extension Set■ Extension set enables standard Master Lock Nos. 1654, 1655, 1670 and 1671 combination locks to operate in 11/16" (17mm) to 3/4" (19mm) thick standard locker doors. ■ Meets the needs of the expanding health and country club markets, as well as those of corporations (employee lockers, health centers) and schools.■ Retains standard combination dial, control key operation and convenient push button combination change features.Each set contains: ■ 1 Disc Shaft Extension ■ 1 Cylinder Extension ■ 1 Clutch Driver Extension ■ 2 Screw ExtensionsExtension Set Assembly Instructions:1. Assemble Disc Shaft Extension first,with "V" marker facing away from Inner Assembly. Turn part until seated into Inner Assembly.2. Assemble Cylinder Extension into Disc Shaft Extension with "V" marker facing away from Inner Assembly. Turn part until seated into Disc Shaft Extension.3. Assemble Clutch Driver Extension over Disc Shaft Extension,with "V" marker facing away from Inner Assembly. Turn part until seated into Inner Assembly.4. Assemble Screw Extensions to Dial Assembly.5. Continue with standard built-in combination lock installation instructions.