The new RH540S spline combination rotary hammer from Bosch provides maximum productivity in all day drilling and chiselling applications. Equipped with 6.1 ft/lbs of impact energy (E.P.T.A.). The new RH540S provides up to 39 percentage more impact energy versus the previous model for best in class performance. The new RH540S also provides variable speed. This delivers better bit control during application start-up.