Panasonic EY7840LN2S 14.4-Volt Li-ion Rotary Hammer Kit Compact and Lightweight. Length 9-Inch 5.1lbs Hammer mode: 0 -1,000 rpm and a maximum of 4,000bpm with a hitting force of 21.6 Kn. Drill mode: 0-1,000 rpm 5/8-Inch Chuck SDS Plus Bit System GuardION Battery Protection System