Specification: ​ ​1.Thread :SDS PLUS/M16 ​2.Pin Quantity:21. ​3.Roller Quantity:3. ​4.Roller tips can be re-dressed with blades when they become inefficient. ​5.Recommended Speed: 800-3000 RPM ​ ​Bush hammer tool can be used with SDS PLUS Electric hammer， floor machines or powerful grinders for bush hammering granite marble stone surfaces.