Choose The Morse MHS25 Advanced Bi-Metal Hole Saw for optimum cutting performance The Morse MHS25 (177252) Bi-Metal Hole Saw has a diameter 1. 9/16in - 40mm. The All-New Advanced Bi-Metal Hole Saw by Morse is their latest sawing innovation, a simple optimized powerhouse. Engineered for optimum cutting performance and longer life. The exceptional durability yields cost per cut savings over other saws. Applications in: Wood, plastic, machinable metals, stainless steel alloys, nail-embedded wood. Sold without Arbor or Pilot Drill. Compatible with Morse MA45PS (139038) 7/16in Hex Pin Arbor. Features: New Cap - reduces runout and vibration Heavy-Duty .050 Side Wall - for greater stability New Side Slot - increased leverage for faster, easier slug removal Patent-pending tooth design - optimized to remove material faster New Exterior Red Coating - reduces side wall friction for efficient cutting Premium M42 high-speed steel cutting edge 8% Cobalt - over 2X the life of Morse AV model Specific