$50.99 Hole Saw Arbor, 1/2 Solid/Hex Shank, Fits 1-1/4 to 6 Bimetal Hole Saws - 1547679 
CRAFTSMAN 1/2-in Hole Saw Arbors in the Hole Saw Arbors department at Lowes.com
STARRETT Bi-Metal Hole Saw,w/Arbor,1-1/2,38mm ADCH0112 - Walmart.com - Walmart.com
