Amana tool 51672 118 Deg Point Center Dril High Performance SC AlTiN Coated 60 Deg Double End Dril 2-Flute 5/16 D x 1/8 CH x 5/16 SHK x 2-1/8 Inch Long Countersink

60° inclusive countersinks drill downwards a small amount in order to make a quality starting hole and a profile. Follow up with a secondary drill for the full depth of cut of the workpiece. They don't route along a slot. Combination drill/countersinks provides exceptional starting positioning for secondary drills, PLUS provide qualified countersink dimensions for screw heads, etc. Premium Aluminum Titanium Nitride (AlTiN) coating provides quantum increases in productivity, either in terms of speed or longevity, with or without coolant. Use on manual or CNC driven lathes and manual or CNC driven milling machines. Excellent for cutting: Acrylic Stone Cast Iron Cermet* Composites Corian Coroplast** Poly (methyl methacrylate) (PMMA) Soft Plastics Stainless Steel Steel Titanium *Cermets are composites in which ceramic materials and metals join together. **Coroplast is soft plastic cardboard made with super soft, super flexible PVC.AlTiN Coating Benefits: Extra wear resistance Allows for faster feed and speed rates Cutting edge protected from wear Better chip evacuation Less heat build up Superior cutting quality and extended tool lifeWARNING! Inspect cut quality and adjust feed and speed accordingly. Care should be taken to observe proper feeds and speeds according to the workpiece material to avoid damage.Note: For optimal results and extended tool life use mist lubricant system or air cooling.