Amana tool 55124 Carbide Tipped Countersink with Slow Spiral Stepped Dril 7/16 D x 11/64 Dril D x 5/16 Round SHK

2-Wing Round Shank With Slow Spiral Steel (HSS) M2 DIN 338 Fully Ground Stepped Drill Bit Available in a wide variety of sizes. Carbide-tipped for long lasting results in hardwood, plywood, plastics, etc. Excellent for Drilling: Natural Woods Man-Made Boards MDF Chipboard Plywood Aluminum/Non-Ferrous* Aluminum Composite Materials (ACM)* Composite Decking Materials *WARNING!: For optimal results and extended tool life use lubricant or air cooling. Ensure the material is fixed and drill is stable while drilling.