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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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Used to chuck threaded drill bits and countersinks into a regular drill chuck. 1/4" shank on one end: 1/4-28 female threads on the other. 8" overall length. Made in the USA!