Bosch Standard Arbour 1/4in 6.35mm (Hex Shank) for Holesaws
Bosch Hexagon socket adapter 1/2"-20 UNF, 14-30 mm
It is suitable for use with all corded and cordless drill drivers. The Hexagon Adapter connects the hole saw to the power tool with a mandrel.
For Dia. 14-30 mm incl. HSS-G Pilot Drill Bit - Suitable for HSS Bi-Metal Holesaws