Starrett A5 Arbor Extension For A2, A17 - 12 & XA2 Arbors This Starrett A5 extension fits A2, A17 - 12 and A2 arbors. It is compatible with hole saws ranging between 32 mm and 210 mm wide. The pilot drill can be replaced easily thanks to the set screw in the arbor body. It can also be used with FCW hole saws. FEATURES Fits A2, A17 - 12 and A2 arbors Compatible with hole saws between 32 and 210mm wide Also compatible with FCW hole saws Extends hole saws by 300mm/21\" SPECIFICATION Pack Quantity: x1 Pc Part No: A5 Fits Hole Saw Diameter: 32 - 210mm Fits Chuck Size: 13mm