The new Bosch RH745 1-3/4 in. SDS-max rotary hammer features best in class drilling and chiselling performance with 7.6 ft.-lbs. Impact energy (Penta). The hammer features 2 modes of operation. Rotary hammer or hammer-only and a variable speed dial for controlled drilling and chiselling applications. The tool also features the Vario-Lock function. This allows the chisel to be rotated into 12 different positions to optimize the working angle when used in hammer only mode.