Diablo Wood Auger Bit Set DAG1900 S3 7 16 Inch Hex Quick Change Shank (3 Piece Dura Tip High Speed Steel Nail Embedded Drilling 5 8 3 4 1 In) Chalk Boxes Manufactured using high density TiCo titanium Manufactured using high density TiCo titanium cobalt carbide cutting flutes and protected by a non stick red Perma SHIELD finish 9 HP Horizontal OHV Gas Engine with 6:1 Gear Reduction and 1 Inch Keyed Shaft engineered to drill through dense structural timber and nail embedded lumber without binding Dual Edge Two Step Cutting: Double cutter edges score wood cleanly before clearing material to eliminate wood fiber splitting and tool snagging