Based on our own experience, this milling accessory is a complete waste of money. We've used it on both steel and aluminum with poor results. The flutes clogged during the milling process and required constant cleaning, which caused a significant delay in our production. The only advantage of this product is that it's made of tungsten carbide, which is a durable material. Sadly, this does not justify its poor performance. Industrial and scientific professionals should avoid this product at all cost.