Bosch HS1936 R-Tec Star Point Chisel Twist SDS-MAX Hammer Steel, 16 InchBosch R Tec technology for SDS max chisels use an energy diverting reflection element that increases material removal. The tool and bit do more of the work with less vibration for the user. Highlights: Size: 16 inch Star point twist tip is self sharpening and less binding Reflective element reflects the energy of the return shock, then converts it into new impact energy to increase material removal Offers 100 hours of working time without interruption