M.K. Morse® Hole Saw, Advanced series, Bi-Metal Body, M42 HSS-Co 8 Cutting Edge, Toothed Cutting Edge, Hex Shank, Use Arbor: Ma45Ps, Red, Applicable Materials: Machinable Metal, Nail Embedded Wood, Plastic, Stainless Steel Alloy and Wood. The All New Advanced Bi-Metal Hole Saw by M.K. Morse®. Our Latest Sawing Innovation Replaces All Current Morse Bi-Metal Hole Saw Solutions Into One, Simple Optimized Powerhouse. Arbor Required.