Bahco 630 Arbor 1/4in is suitable for 14-30mm holesaws for use with hand held machines. All arbors are hardened for maximum strength. The 3834 Series Arbors are available in a range of sizes suitable for different chuck capacities. Shank size: 6.4mm.This Arbor has the following specification:Size: 14-30mmShank: 6.4mmAdditional Information:• Accessory Type: Arbor