Lasts up to 2x longer than a standard HSS M3 Hole Saw. Highly efficient for electricians and plumbers. Long Life. For use with the Bosch Power Change Plus keyless arbor: offering accuracy and robustness. Kit including adapter nuts for hole saws with thread to convert them to PC Plus quick change hole saws. Scope of delivery: Bosch PRO Multi Material PC Plus Starter Kit, 68 mm, 5 pcs.