The Milwaukee C12PD hammer drill along with a 2 gears of varying speed varieties. There is a gear that controls speeds from 0-400 rpm (rotations per minute) and there is a gear that controls speeds from 0-1500 rpm. Plus this, drastically for the hammer drill to provide speed array of 22500 revolutions per minute. This is when the drill is working at its the highest. The speeds of this drill b