Lasts up to 50x longer than Bosch 2608900445 Hole Saw in tough materials Exceptional durability is built in with Bosch Carbide Technology For use with the Bosch Power Change Plus keyless arbor: offering accuracy and robustness Ideal for cutting neat holes up to 60 mm in depth, for example for tubing for electricians' wires and plumbers' fresh waste water pipes; holes for sockets, light switch, junction boxes; holes for recessed lighting, fire alarms, presence detectors; or for ducting for cool-air or drying air Features Exceptional durability is built in with Bosch Carbide Technology – the hardest metal is integrated into the tooth structure using advanced design and manufacturing techniques. Teeth are made from very hard Carbide by using the finest grains. They are .