Diablo Auger Bit DAG3160 1 1 2 Inch x 17 1 2 Inch (Self Feeding Dura Tip Dual Edge 7 16 Hex Shank Wood Nail Embedded Timber Drilling) Circular Saw Blades Industrial Wrap Around Tubular Cradle: Heavy wall Industrial Wrap Around Tubular Cradle: Heavy wall 1 1 4 inch welded steel perimeter frame finished in industrial powder coat paint protects generator components against severe jobsite impacts aged mastics thoroughly The Diablo DAG3160 is a 1 1 2 inch diameter by 17 1 2 inch overall length high speed steel auger bit engineered to bore continuous deep utility pass throughs in heavy timber Self Feeding Dura Tip™ Screw Head: Aggressive threaded lead screw pulls the bit smoothly through wood substrates with minimal operator push effort