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Cutting Tools/Counterbores 

You don't have to have a license to pilot a bore, but if you want to create a flat recessed opening at the top of hole for your socket head cap screw to sit in flush with the top of your piece, you need a counterbore with or without a pilot. KBC Tools & Machinery's counterbores come in blade type, cap screw, and interchangeable pilots for all your counterboring needs. KBC has counterbores available in imperial, numbered, and metric sizes from Brand KBC, APT, and Rock River Tool. KBC - All Counterbores...All The Time