$56.99 Hole Saw Drill Bit Arbors fits hole saw 1-1/4 to 6 Bi-Metal, with bits *5pc* 689958320141 
Lenox 1779771 1/4 x 4-1/4 Pilot Bit for Hole Saw Arbors - BC Fasteners
MK Morse MA45PSCT 7/16 Hole Saw Arbor w/ Carbide-Tipped Bit fits 1-1/4 - 6 50326139816 | eBay
