Makita offers the 11-lb. HM0870C and 20-lb. HM1203C hammers engineered with the Makita Motor Advantage for efficient transfer of energy. The HM1203C is powered by a 14 amp Makita-built motor with 25.5 joules of impact energy and 950 to 1,900 bpm. The HM0870C is powered by a 10 amp Makita-built motor with 11.4 joules of impact energy and 1,100 to 2,650 bpm.