serrated tumbler

  n.
   1. a disk tumbler with "V" shaped notches in its sides that do not allow operation
   2. a lever tumbler which has "V" shaped notches in the contact end near the gate
   3. a pin tumbler with "V" shaped grooves around its circumference
   4. a combination wheel with "V" shaped notches along its outside diameter

Locksmith dictionary . 2014.

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