This is a 4" head with drill pin attachment for easy hook up to a cordless drill. It comes with 4 pcs 20segment hubs and 20 pcs. of Quick-Strip steel brushes. Ready to do rustic sanding on hard wood and soft wood products. The steel will remove soft wood from the wood and make stripping of the hard wood. Making the piece look old and worn. Please see more pictures of the heads by clicking on this product.