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Thread retrac button bits

Product description: Thread: R32, R38, T38, T45, T51, ST58, ST68, GT60. Diameter: 48 mm ~ 152mm; Face type: flat face, drop center.
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Thread retrac button bits use high quality steel and the best alloy made in China, and we produce all thread button bits by the hot insert process to make the bit have good drilling performance and long working life.
Thread: R32, R38, T38, T45, T51, ST58, ST68, GT60.
Diameter: 48 mm ~ 152mm;
Face type: flat face, drop center.

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