This item is practically unusable. A cordless drill isn't powerful enough to split a piece of wood, no matter how dry it is or where I put it. If I use a corded drill and insert it 1/2 to 1 inch from the edge of a piece of wood, it actually splits it. What's happening is only good for Kinlin. Anything deeper and it will just get stuck and end up burning my drill bit. I wish I hadn't bought this.