... in world to know our JIANGSHAN brand diamond tools. 1. single tube bit and reamer:Φ28,Φ36,Φ46,Φ56,Φ59,Φ60,Φ66 ... ,Φ75,Φ76,Φ91,Φ94,Φ110 etc. 2. Double tube bit and reamerΦ28,Φ36,Φ46,Φ56,Φ59,Φ60,Φ75 ... , composite slice bit,diamond oil bit Diamond single-tube bit and reamer Nominal sizeBit Reamer Screw thread Exteral diameter Internal diameter Exteral diameter ...