Milwaukee - Portable and Cordless Lithium-Ion M12TM Rotary Tool Kit / Set (Battery Powered) Powerful 12-volt Motor Unmatched performance under load 1/8 inch Collet compatible with all current rotary tool accessories Variable speed (5,000-32,000) Up to 10-percent faster than the competition Compact and lightweight, 9.5 inches long and 1.3 pounds Dimensions: 13.4 in L x 9 in. W x 4 in. H