Made with Bosch Carbide Technology, each tooth is an optimum grade of the hardest metal, laser-welded and ground 6 times for the perfect cutting shape. Lasts up to 50x longer than bi-metal hole saws in tough materials. Designed for tough jobs and all-round trades work. For use with the Bosch Power Change Plus keyless arbor with 105mm pilot drill bit (arbor and replacement pilot drill bits for use with brick and soft tiles, or wood, drywall, plastics and metal, all available separately). Cuts Wood with Metal, Brick, Soft Tiles, Stainless Steel Sheets & Plastics PowerChange Plus Arbor Steel Slotted Barrel to Aid Removal of Debris For Use with 3-Jaw Chuck Machines on Rotary Action Carbide Technology Cuts Wood with Metal, Brick, Soft Tiles, Stainless Steel Sheets & Plastics PowerChange Plus Arbor Steel Slotted Barrel to Aid Removal of Debris For Use with 3-Jaw Chuck Machines on Rotary Action Carbide Technology