The bosch gbh 36 v ec compact cordless rotary hammer is a compact powerhouse it is as powerful as a corded machine up to 160 drilled holes 6 x 40 mm in c3037 concrete with one battery charge ideal for indoor use with a weight of only 29 kg it is ideally suitable for overhead work there is a pneumatic hammer mechanism optimised for drilling holes of 4 12 mm in concrete max 18 mm innovative coolpack batteries ensure optimum heat dissipation and therefore increase lifetime by u