Bordo 6.5 x 3.7mm 180 Degree Counterbore for M3.5 Screws, 3870-3.5

Description

6.5 x 3.7mm 180 Degree Counterbore for M3.5 Screws
Bright finish HSS-Co5 (Cobalt) for extreme tool life.
Use to enlarge the top of an existing hole to create a cylindrical-shaped opening with a flat bottom that acts as a seat for the head of a screw or wood plug.
Ideal for use with standard cap screws or socket head screws.

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