The Amana Carbide Router Bits are an excellent choice for any industrial and scientific cutting job .Based on my observations, the stainless steel coating helps prevent rust and makes the bit last longer. The carbide spiral design makes cutting through wood and other materials easy and efficient. The only downside is that they are a bit pricey but the durable and long-lasting quality makes the investment worth it. Overall, highly recommend these cutting tools for any PROFESSIONAL looking for high-quality router bits..