The Bosch RH745 SDS-max® 1-3/4 In. rotary hammer features best in class drilling and chiseling performance with 8.2 Ft.-Lbs. Impact energy (EPTA). The hammer features two modes of operation. Rotary hammer or hammer-only and a variable speed dial for controlled drilling and chiseling 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.