... 16" 406.4mmPin shank size: 7 5/8regNormal WOB(bit dia): 0.25--0.70KN/mmRotary speed: 200~80r/ ... gypsolyte, soft limestone and sandstone, etc Main characteristics of bit(cutting structure)The back cone and the teeth all ... tooth shape and welding materials.Normal WOB KN/mm (bit dia.)0.25--0.70Rotary speed (rpm)200~80Payment ... 117 215 216 217 315 316 317 325 327PDC BIT(3 blades,4 blades,5 blades,6 blades)5 ...