The bosch gbh12 52dv hammer drill provides top performance when drilling and chiselling thanks to 1700w motor and 19 joules of single impact energy whilst the speed controller gives optimum adjustment to suit the application automatic switch lock for the best convenience in continuous chiselling applications complete with the low vibration of only 8 mssup2 when chiselling and 10 mssup2 when drilling due to intelligent triple vibration damping system