Tools-Free Operation; No Adapters Required; Durable Hardened Steel Construction; Universal, Quick-Change with All Brands of Hole Saws; Hollow Shank for Full Pilot Bit Access; Fits All Hole Saws 1-1/4 Inch and Larger and Fits All Drill Chucks 1/2 Inch and Larger

Specifications:

Type: Quick Change, Large Thread
Maximum Hole Saw Size: 1-1/4 Inch
Shank Shape: Hallow
Shank Size: 7/16 Inch
Material: Steel
Process: Hardened