Amana tool 55286 Carbide Tipped Counterbore 1/2 D x 1/4 Quick Release Hex SHK

Quick Release 1/4" Hex Shank With Slow Spiral, Includes High-Speed Steel (HSS) M2 DIN 338 Fully Ground Drill  Flat bottom counterbores for using round head screws, hex bolts, etc. Includes pilot drill. Carbide-tipped for long lasting results. 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.