The milwaukee m18chx fuel sds43 hammer 18 volt has a powerful hammer mechanism that delivers 28 joules of impact energy and a compact ergonomic design for increased end user comfort the all metal gear case provides optimum seating of the gears for enhanced service life and offers 4 modes of operation rotary hammer rotation only chisel and chisel lock off it is fitted with a milwaukee designed and built brushless powerstate motor for up to 2x longer motor life and up to 25 more power redlink