Button bits Size: 30, 32, 34, 38, 40, 43, 50mm Connect: hex19, hx22, hex25 taper rod Tips: spherical, parabolic button Specialisted in producing of varies type of button bits in different size in China for many years. Including of tapered button bit, retract button bit, thread button bit. With ISO certificate & quality control. Button bits with 6tips, 7tips, 8tips, we do them according to ...