Review on 🔧 Enhanced Performance with Cobra Carbide 20513 General Diameter: Perfect for Precision Machining by Chef Deane

Let's look at the previous reviews first. This end mill is exactly as described. The coating is titanium aluminum nitride (TiAlN) as described and is actually purplish black in color. This is different from the image, which for some reason only shows titanium nitride (TiN). In fact, TiAlN is the best and generally more expensive coating at higher hardness and temperatures above 800°C to create an aluminum oxide layer that reflects heat back into the chip and away from the tool and workpiece during dry cutting. This has been a great beat so far and it works great at higher speeds and in my ops. I am very impressed with the quality of this tool.