This is the 12" spindle with 3/4" arbor for a motor that you would have to provide. The motor should be 1-2HP and have variable speed if possible. The heavy duty rustic brush works great with hard woods and softwoods. The new design made by QuickWood came out in the end of 2011. The twisted wires gives this rustic brush a long life time compared to straight steel brushes. The twist also give the rush brush more power to digg out the hard wood for deep distressing of hard woods.