Bosch 2608594297 Powerchange, 25mm Holesaw + 2 Standard Converters Kit The Bosch 2608594297 Kit consists of a Power Change Adapter for Holesaws that fits sizes 16mm - 210mm, 2 converters and a Bosch HSS-Bi-Metal Progressor Holesaw, 25mm in diameter. BiM Progressor Hole Saws offers 2x longer lifetime than its predecessor. It has been designed with Bosch Bi-Metal with 8% cobalt alloy for increased durability. Additionally, it has an enhanced progressive tooth strip that enables faster cuts. Use this hole saw when drilling holes in wood, drywall, plastics, metal, non-ferrous metal and stainless steel. It is suitable for use with all corded and cordless drill drivers. Part of the Progressor Range for Wood and Metal. Power Change Adapter 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 25mm Holesaw Features: BiM Progressor Hole Saw offers 2x longer lifetime than predecessor Redesigned with Bi-Metal with 8% cobalt alloy for increased durability Enhanced progressive tooth strip enables faster cuts Suitable for multipurpose use Power Change Adapter Specification: Shank: Hex 6.35mm / 1/4 Inch Pilot Drill: HSS-G 7.15mm x 85mm  Compatible With Holesaws: 16mm - 210mm Holesaw Specification: Diameter: 25mm / 1in Working Length: 44mm