The Makita 8.3 Amp Demolition Hammer (model HM0810B) is built around a powerful motor that delivers up to 5.6 ft. lb. of impact energy (7.6 Joules) and 2,900 BPM for fast, efficient work. An anti-vibration spring works in concert with a soft-grip, 360-degree rotating handle for improved comfort and lessened fatigue. This hammer includes a hex wrench and case for added value.