1)8 3/8'' kingdream water well bit 2)pin shank size:0.25~0.70 3)sealing:rubber seal 4)processing type:forging ... /27 7/8,8 1/2,8 3/410 5/8,12 1/413 3/4, 17 1/2,22, 24,26417 ... 117 215 216 217 315 316 317 325 327PDC BIT(3 blades,4 blades,5 blades,6 blades)5 1/2 ... /27 7/8,8 1/2,8 3/410 5/8,12 1/413 3/4, 17 1/2,22, 24,26M223 ... want more information,please feel free write to me. 8 3/8'' kingdream water well bit