To ensure proper installation of built-in combination locker lock models 1654(5) and 1670(1), extension sets are required for doors with a thickness of 11/16" (17mm) to 3/4" (19mm).  Standard combination dial, control key operation and convenient push button combination change features are retained.

Each set contains:
      1 Disc Shaft Extension
      1 Cylinder Extension
      1 Clutch Drive Extension
      2 Screw Extensions
      Assembly instructions