Use with Diamond Plus threaded hole saws to optimize productivity when cutting hard, abrasive materials. Fits standard 5/8"-11 spindles for faster drilling. No. 49-56-7103: Arbor Size: 5/8"-11, For Use With: Diamond Plus Hole Saw 3/16" to 1-1/8", Pkg Qty: 1, Package Type: Box No. 49-56-7105: Arbor Size: 5/8"-11, For Use With: Diamond Plus Hole Saw 1-1/4" & Larger, Pkg Qty: 1, Package Type: Box