Brushless motor provides 50 percent more run time. Powerful motor has 370 MWO of power for heavy duty Applications withminimal stall. Transmission has 1,800 max rpm for speed of drilling and fastening applications. 1/2" Ratcheting chuck for improved and reliable bit retention. Compact size of 7.4" for work in tight spaces. Lightweight design at only 3.3 lbs for less fatigue. mode Collar allows you to switch from drilling to fastening mode without losing your clutch setting.