... :hex19mm, hex22mm (2) Diameter:26-100mm. (3) Taper:degree 4"46, 6, 7, 11, 12 —MAXDRILL Tapered Chisel BitTapered Chisel Bit is generally ... matched with the light-duty rock drill, to drill the rock hole within diameter of 50mm ... , quarry stone project etc(1) Type: chisel bits(2) Size: 19mm, 22mm, 25mm(3) Diameter: 26-100mm.(4) Taper: degree 4°46 ...