High-Performance Materials: Hole saws made of M42 high-speed steel and BI metal, with higher hardness ( 65HRC), higher toughness, higher cutting strength and stronger wear resistance. Efficient & Smooth Cutting: High-quality bi-metal band and the best cutting performance of HSS teeth combines with Non-binding clean edge design ensures smooth and clean cutting of the hole saw blade. Widely Used: Hole saws can cut 6-1/4 inch diameter holes in wood, plywood, plastic, drywall, soft plaster, cornhole boards and thin metals. In addition to punching cans or recessed lights, punching saws are also suitable for home projects on air ducts, speakers, ceiling lamps, etc. Warm Prompt: Keep the drill bit in contact with the cutting surface straight at a low speed. Take some time for the saw to cut, so you can get a smooth and clean round cut; the cutting depth is 1.4 inches.