R25, R28, R32, R35, R38, T38, T45, T51, ST58, ST60 ...
Superdrill Threaded button bits. With the top quality of alloy steels imported from USA and the best carbides made in China, we produce all threaded button bits by hot press technology. A comprehensive range of various button bits shown as below: Thread sizes: R25, R28, R32, R35, R38, T38, T45, T51, ST58, ST60, GT60; Head diameters: 33mm ~ 152mm;
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