Replacement part 7/16" Large Thread Quick Change Arbor Compatible with Milwaukee 49-56-7055 (Thread Size: 5/8") Shank Size: 7/16" Hex Thread Size: 5/8"-18 Compatible Hole Saw Sizes: 1-1/4" and up Pilot Bit Used: 49-56-8000 Fits Drill Chucks: 1/2" and larger