The milwaukee m18 chpx fuel high performance sds plus hammer has 4 modes of operation rotary hammer hammer only rotation only and variolock for maximum versatility it is the hardest hitting cordless sds hammer in its class the powerful hammer mechanism delivers 43 joules of impact energy at low 86 ms vibrations thanks to the new dual rail anti vibration system it is fitted with a brushless powerstate motor with an all metal gear case for optimum seating of the gears and for enhanced service l