Lenox 33150 (LL150) 1-1/2" Self Feed Wood Bit 1-1/2" Diameter Leader Self-Feed Bit 1/2" Shank Diameter, 5-1/2" Overall Length Precission ground teth and outside diameter threads maximize tool performance Extra long to cut through 4X4 with no extension required Can be re-sharpen with Lenox 32510-STF (Slim Taper File with Handle)