The Bosch EXPERT Powerchange Plus Arbor is the fastest quick-change system for holesaws. It features a unique adapter for locking and unlocking the holesaw and pilot drills with one click, and offers easy plug removal. The entire system is keyless for added speed and efficiency. This arbor connects the holesaw to your power tool and allows for fast quick change. It also includes two screw-in hole saw extension adapters that make other brand holesaws (e.g., DEWALT, Abracs, Milwaukee) compatible with the Bosch Power-Change system. This set includes an adapter nut for 14-30mm diameter holesaws and an adapter nut for 32-210mm diameter holesaws, along with a pilot drill. Set Contains: 1x Power Change Quick Change Arbor, 1x HSS-G Pilot Drill Bit, 1x Adapter nut for standard holesaws (14 - 30mm), 1x Adapter nut for standard holesaws (32 -210mm). Compatible with Bosch Power-Change system.