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This drill bit design is CKK's Countersink eyelet hole bit for sheath and holsters. Our countersink bit features the exact cutting angles needed for professional hole reaming on all forms of thermoform plastics, such as KYDEX®, HOLSTEX® and Boltaron. This eyelet hole tool is designed to fit standard cordless drill chucks, as well as drill press units. The hexagon shank eliminates chuck slippage and maximizes finish quality. Proper eyelet hole burr removal is the mark of professional holster making. This inexpensive tool is extremely high quality and will last a lifetime.