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