The QUIK-LOK™ Arbor Set provides fast hole saw changes and and easy plug removals and is designed for ultimate durability and strength for the all-day demands of the job site. The Arbor is compatible with all Milwaukee QUIK-LOK™ Holesaw Adaptors designed to fit all Milwaukee and industry standard threaded hole saw sizes and types. 11mm (7/16") Shank suits 13mm chuck. The included reusable 5/8"Pin Adaptor is compatible with hole saws from 32mm up to 210mm and transfers maximum torque without the risk of thread stripping, binding or spin-off. The included 1/2" small thread adaptor is intended for hole saws from 14mm to 30mm with 1/2" x 20 UNF. Use 4932500553 Enlargement adaptor with dual holesaws to enlarge existing holes. Use 49569300 Pilot Bit with included 5/8" Pin adaptor (4932500552) for any BIGHAWG™ holesaw. Use replacement pilot bit 49568000 when needed.