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 a bi-metal holesaw in tough materials. Ideal for tough jobs and all-round trades work. For use with the Bosch Power Change Plus keyless arbor offering accuracy and robustness. Suitable for tubing for electrician's wires, plumber's fresh and waste water pipes, holes for sockets, light switches and junction boxes. 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