Bi-metal hole saw. Optimized for cutting steel including stainless steel. Cuts precise holes in stainless steel and mild steel, drywall, ceiling tile, laminates, wood and plastic. Longest lasting, fastest cutting blade on the market. Multiple slots provide different leverage points to easily remove slugs. Heavy duty steel construction includes 5 mil back plate to withstand abuse. Hex shaped base for easy removal from arbour. Use with Klein tools arbour 31905.