Bosch HS1903 Flat Chisel, 16 in L, 14 in L Flute, 1/2 in Dia Shank, Steel, SDS Max ShankBosch R Tec technology for SDS max chisels use an energy diverting reflection element that increases material removal by 15%. Because the energy is dispersed back into the material, the tool and bit do more of the work with less vibration for the user. R Tec chisel features a unique cutting head with extra wedges for increased breakout. Unit: EA UPC: 000346341089 Model Number: HS1903