[SIZE] - 6mm 12T 17.5mm gear diameter[PACKAGE CONTENT] - 1 x Drill Chuck Key[CONSTRUCTION] - Made from solid carbon steel and coated with durable paint[COMMON USE] - for drill locking and opening, keep your drill bits firmly in place[GENERAL PURPOSE] - Helps with securing drill bits in hammer drills and is also universal for many other types of drills.
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