Irwin 373003 Hole Saw Arbors, 3/8 in Shank

Hole Saw Arbors, 1/2 in Hex Shank

Hole Saw Arbor, Round 1/4 in Shank

Hole Saw Arbor, 3/8 in Hex, 3/8 in Arbor dia, 1/2 in-20 Thread, Standard Pilot Arbor

Hole Saw Arbor, 3/8 in Hex, 5/8 in - 18 TPI

Tiger Type 1 Wheel Mounting Mandrel, 3/8 in Arbor Hole, 1/4 in Shank