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. Suitable for tubing for electrician's wires, plumber's fresh and waste water pipes, holes for sockets, light switches and junction boxes. For use with the Bosch Power Change Plus keyless arbor with 105mm pilot drill bit. Replacement pilot drill bit (Code 139PF) for use with brick and soft tiles. (Code 155PF) for use with wood, drywall, plastics and metal. 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...