3-Pc Solid Carbide AlTiN (Aluminum Titanium Nitride) Coated Spiral CNC Router Bits / End Mills for Cutting Steel & Stainless Steel These router bits are manufactured from our exclusive ultra-fine micrograin carbide and feature a 30 degree Center Cutting Mill End a corner chamfer (for extra strength) up cut design and very importantly Aluminum Titanium Nitride (AlTiN) coating for superior cut quality. Excellent for cutting: Stainless Steel Steel Cast Iron Composites Low Carbon Steel Magnesium Plastics Super Alloys Titanium (up to 40HRc Hardness) These bits are perfect for the signmaking industry. Our special carbide grade combined with the AlTiN coating gives amazing performance. The unique corner chamfer gives the bits great strength. AlTiN coating has many 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 life   WARNING: 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.