Lasts up to 50x longer than a bi-metal hole saw in tough materials. Carbide teeth barely slow down when hitting metal. Cuts neatly through and keeps on cutting holes. Each tooth is an optimum grade of the hardest metal, laser welded and ground 6 times for the perfect cutting shape. Suitable for wood, metal, stainless steel, brick, soft tiles and reinforced plastics. For use with the Bosch Power Change Plus keyless arbor. Cutting depth up to 60mm. Cuts Wood with Metal, Brick, Soft Tiles, Stainless Steel Sheets & Plastics Steel Slotted Barrel to Aid Removal of Debris 22mm - 68mm Dia. Holesaws For Use with 3-Jaw Chuck Machines on Rotary Action Carbide Technology Cuts Wood with Metal, Brick, Soft Tiles, Stainless Steel Sheets & Plastics Steel Slotted Barrel to Aid Removal of Debris 22mm - 68mm Dia. Holesaws For Use with 3-Jaw Chuck Machines on Rotary Action Carbide Technology