Bordo 180 Degree Counterbore (3870)

• 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.
• Counterbore use with Fillister cap screw and ejector caps in moulds.