Lithium ion lxt cordless hammer drill driver has a 2 speed gearbox 13mm keyless chuck and 42nm torque the 2 speed settings on the bhp453rfe provide maximum versatility for use into a variety of material. The makita bhp453 rfe uses lithium ion battery technology which has a number of advantages the batteries have no memory effect which allows them to be recharged before they are completely discharged they are up to 40% lighter than a ni cad or ni mh battery and they also maintain their charge noticeably longer which provides increased productivity.