Morse MHS68 (177689) Advanced Bi-Metal Hole Saw 4. 1/4in - 108mm Diameter The Morse MHS68 (177689) Bi-Metal Hole Saw has a diameter 4. 1/4in - 108mm. 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: Patent pending tooth design - optimized to remove material faster New Cap - reduces runout and vibration Premium M42 high speed steel cutting edge 8% Cobalt - over 2X the life of Morse AV model Heavy Duty .050 Side Wall - for greater stability New Side Slot - increased leverage for faster, easier slug removal New Exterior Red Coating - reduces side wall friction for efficient cutting Specification: Diameter: 4. 1/4in - 108mm Cutting Depth: 1-15/16in - 49.2mm