Home Products Power Tool Accessories Hole Saws Hole Saw Arbors Series B Hole Saw Arbor – 5/8-18 Thread, 3/8″ Shank, 3/8″ Chuck Series B Hole Saw Arbor – 5/8-18 Thread, 3/8″ Shank, 3/8″ Chuck (05304) Fits bi-metal hole saws 1-1/4-Inch to 6-Inch Threads are 5/8-18 Shank size 3/8-Inch Find a Retailer Find on Amazon