SINODRILLS Tapered chisel bits   Tapered chisel bits are widely used for mining, tunneling and quarrying. We manufactuer various diameters of tapered chisel bits from 26mm to 45mm in different tapered degrees, as below, they are our tapered chisel bits specifications: Bit diameter: 26mm ~ 45mm; Taper degree: 4°46’, 6°, 7°, 11°, 12°; Shank sizes: Hex. 19mm, Hex. 22mm, Other speical designs are available upon request