Hole Cutters, Hole Cutter, Primary Saw Application Metal, Saw Dia. 3 1/2 in, Max. Cutting Depth 1 in, Arbor Design Built-In, Tooth Material Carbide Tipped, Number of Teeth 6, Shank Size 3/8 in, Pilot Drill Size 1/4 in dia, Replacement Pilot Drill No. Mfr. No. CTDP, Application Sheet Metal, Stainless Steel, Pipe, Aluminum, PVC/ABS, Plastic