Milwaukee Hole Saw Arbor, Small Thread, Up to 1-3/16 in Arbor, Hex Shank, 3/8 in Shank, Steel Cutting Edge, Hardened Steel
3/8 in hex shank for greater gripping capability in the chuck|Fits all hole saws up to 1-3/16 in|Fits all drill chucks 3/8 in and larger