This End Mill is AMAZING. I taught myself how to cut steel with a drill press converted to an end mill. I made many mistakes and even damaged part of the cut surface, but it just keeps working. You won't believe the amount of abuse I've taken on this jet even when it's binding and jamming at 3000rpm, but it continues to work. The use of coolant increases the service life at high speeds. This nozzle also works very well as a dilator.