... ,chisel bits,button bits,cross bits,rock drilling bit,sandvik,high quality blade bit,cross bit Xiamen Betopper Mining Machinery Co., Ltd. is ... , Thread Drill Bits and other Rock Tools.1. Bit Type: high quality blade bit2. Diameter : 28mm - 65mm3. Taper: 6°, 7 °, 11°, 12°4 ... °)6071 210.9DS65-7257°(6° 11° 12°)6571 211.1 high quality blade bit