1) M3/M42 bi-metal construction for heavy duty cutting. 2) Variable pitch for faster, smoother cutting and less vibration 3) Longer lasting design for more cuts per saw (consecutive cutting over 100 hole in stainless steel board) 4) Multiple knock-out slots and holes for easy core removal 5) Cutting depth to 1-1/2" (38mm) and 1-7/8" (47mm) 6) Diameters form 9/16" - 8-17/64" (14-210mm) 7) Can be used in portable electric or pneumatic tools, vertical drill machines, lathe, boring/milling machines and other machine tools 8) Cuts through stainless steel and other materials pipe, nail-embedded wood, hard wood floors, plywood and plastics 9) Extra charge for the pilot and arbor