ITOOLFIRM HSS Bi-Metal Hole Saws, advanced edition: Matt Black and Frosted Orange. Features: Extreme Resilience & Long Lifetime. Powerful Bite & Accelerated Chip Clearance. Knock-out slots permit slug removal. Variable pitch teeth reduce harmonic vibration. Hex Shank works with standard or Quick Change mandrels (Quick Change requires adapters). Can be used in Cordless, Electric, Air Drills, Drill Press, Lathe and Milling Machines. Reinforced shoulder for added strength and longer life. Suitable for cutting viariable materials: Wood, Hard Wood Floors, Plywood. Plastic, Fiberglass, UPVC / PVC, Acrylic, Glass. Steel, Cast Iron, Stainless Steel, Alloyed Aluminum, Bronze, Copper. Applied to: Punch holes for household wood, galvanized pipe, fire hose, Gypsum, Upvc/PVC Boards. Install downlights, ceiling recessed lights, vent, fans, cable. Instructions: Pre-drill using light contact pressure. Continue drilling with minimal, even pressure. Avoid oscillating while drilling. Allow hole saw to “air” when using with wood and wood alternatives. The saw comes to a complete stop on your material before pulling it away.