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Suitable for 32-152 mm holesaws. For use with handheld machines. Shank size: 8.5 mm. All arbors are hardened for maximum strength.Quick change arbors have a quick change mechanism and do not need tools to change the holesaws. This Arbor has the following specification:Size: 32-152mmShank: 8.5mmAdditional Information:• Accessory Type: Arbor