Features : Alternate set variable pitch 4/6 teeth – producing tighter grip, less vibration, cleaner faster cut Holesaws can be used in electric-,pneumatic drills, vertical drilling machines and lathes Heavy duty bi-metal construction Original pattern pressed gap gives full cutting depth M3 steel cutting edge keeps teeth sharper longer Shatterproof body designed for stying power Holesaws, arbors and pilot drills are fully interchangeable with all leading manufacturers holesaw products