... Specialisted in producing of varies type of button bits in different size in China for many years ... button bit. With ISO certificate & quality control. Button bits with 6tips, 7tips, 8tips, we do them according ... , 33mm, 34mm, 36mm, 38mm, 40mm, 42mm, 44mm and so on. With different degree taper) Tapered Rod (Rod ... , 64mm, 70mm, 76mm, 89mm, 102mm, 115mm, 127mm and so on. R25--38mm, R25--41mm, R28--38mm, R28 ...