Bosch 2608594253 Power Change Adapter for Holesaws 16mm - 210mm The Bosch 2608594253 Power Changer Adapter fits Bosch Holesaws with diameters from 16mm-210mm. Part of the Progressor Range for Wood and Metal. Features: 1/4 Inch Hex Arbor complete with 7.15mm diameter x 85mm long HSS-G Pilot Drill suitable for Bosch Progressor Holesaw range Fast tool-free holesaw change using the Bosch Powerchange Adapter Power Change Plus System offers more precision than its predecessor Reinforced shank provides improved tolerances, creating less play and greater accuracy Enables better guidance due to pilot drill bit Unique keyless system only requires a simple click to unplug the hole saw, offering fast and easy plug ejection Specification: Shank: Hex 6.35mm / 1/4 Inch Pilot Drill: HSS-G 7.15mm x 85mm  Compatible With Holesaws: 16mm - 210mm