Ivy Classic 10750 1 X 16-Inch Swift Bore Wood Spade Bit, High-Carbon, 1/Card IVY Classic Industries is dedicated to producing a comprehensive, quality line of power tool accessories and hand tools. IVY Classic Swift Bore 16-Inch Wood Spade Bits, constructed out of drop-forged high-carbon steel, are designed for the fast, smooth cutting of plywood hard wood and soft wood. These precision ground and polished bits feature double fluted chip removers with sharp spurs which ensure faster cutting with a smooth finish. Additionally, these bits have been electronically heat treated and tempered to a Rockwell Hardness of 47-52. IVY Classic Swift Bore Wood Spade bits are available in a variety of sizes. Drop-forged high-carbon steel for fast, smooth cutting of plywood, hard and soft woods, Swift Bore (Registered Trademark) Double-fluted chip removers with sharp spurs ensure faster cutting with a smooth finish Electronically heat treated and tempered to Rockwell Hardness 47-52 Precision ground and polished Diameter: 1-inch, Length: 16-inch, Shank: 1/4-inch hex