SINODRILLS 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; Face designs; flat face, drop center, uni-face; Skirt designs: normal, retrac, straightrac SINODRILLS Tapered button bits Tapered button bits are the most popular tapered drill bits with a wide selection of head diameters from 26mm to 48mm. With carbide buttons hot pressed on the bit skirts, tapered button bits have a good drilling performance and are excellent in longevity.  We manufactuer various tapered button bits in different degrees as below: Bit diameter: 32mm ~ 48mm; Tapered degree: 4°46’, 6°, 7°, 11°, 12°; Shank sizes: Hex. 19mm, Hex, 22mm and Hex. 25mm; Buttons configuration: 4 buttons, 5 buttons, 6 buttons, 7 buttons, 8 buttons, 9 buttons