Cutting and drilling stainless steel is not easy. This hole saw cut through my 3mm stainless steel cooker as if it were plastic. It turned out a nice round hole. I recommend this product 100%. The only problem was my fault - I bought the saw exactly sized for the valve I was installing. This means the hole was too small. Hand feeding SS is not easy. I should have bought the 20mm version. Operator error does not saw.