DeWalt D180076 Deep Cut Metal/Wood Hole Saw 4-3/4" - Bi-Metal"DEWALT ACCESSORIES" HOLE SAW Optimized tooth design for superior performance while cutting metal. M3 steel provides longer life then the MS steel of the industry standard product. Thick, hardened backing plates prevent warping at holes and increases cycle. Versatility of deep cut style allows users to cut either wood or metal. Highlights: Industrial duty Max. speed: 70 4 3 4" (121mm) Bi Metal Hole Saw Double tooth design strengthens each tooth for