The Hoof Buffer attachment fits into any drill with a 3/8″ chuck or larger. Used on a cordless drill this is a very handy tool for cleaning the hoof wall and removing any marks, rings or gouges. Comes with one drum belt – 100 grit. Attaches to cordless or electric drill. 2″ x 4″ sleeves in 60, 80 and 100 Grit. The recommended air pressure for the FootPro Hoof Buffer is 7-10 lbs. Using a hand pump only.