This is the 4" drill attach head with a 1/2 pin coming out of the head for your drill. This thing in my mind is a bit to heavy for holding in your hand at 7 lbs. If you could setup your drill in a fix position and the slide the board under it and do the work that way that would work the best. If you buy the 4" drill head with the twisted steel please be warned that this will make your hand hurt by the end of the rustic run as its heavy. The 4" drill head comes with 5 twisted steel brushes and can do up to 4" at a time for heavy duty rustic sanding.