Wood Owl 03805 1/2" Diameter x 18" Long Nail Chipper Tri Cut Auger Boring Bit PTEE Coated 1/2 diameter x 18 long Patented Tri-Cut design with three precision ground cutting edges and three flutes engineered to optimize performance Unique Tri-Cut head balances the bit as it cuts and minimizes kick-back as nails are reduced to chips PTFE Teflon  coated to minimize friction and allow quick and easy chip ejection in the sticky woods Can be resharpened