The Klein Tools 31922 1-3/8 in. Bi-Metal Hole Saw is optimized for cutting steel. This unit cuts precise holes in stainless steel and mild steel, drywall, ceiling tile, laminates, wood and plastic. A heavy-duty steel construction includes a thick back plate to withstand difficult conditions on the job. Users are provided with a tool that features a 1-3/8 in. hole diameter. Multiple slots provide different leverage points to easily remove slugs. A hex-shaped base for easy removal from arbor.