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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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Use with a reverse pilot / reverse mandrel to countersink in areas that are otherwise inaccessible.
BAT4004-4 5/16" overall diameter with a 5/32" pilot hole. 100 Degree.