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Brown Aviation Tool Supply, LLC 2536 SE 15th Street Oklahoma City, OK 73129 Toll Free 800-587-3883 (US & Canada) Local 405-688-6888
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High-speed steel counterbores (also known as Spotfacers)come with 1/4" shank and can be used in drill presses or hand drill motors. Special four-flute design permits quick cutting. Pilots are interchangeable.
BAT4015-4 7/16" diameter with a 1/8" pilot hole