Bit Extension, Shank Size 3/8 In., Shank Shape Hex, Fits Hole Saw Dia. 1-1/4 In. to 8 -9/32 In., Material Carbon Steel, Pilot Drill Size 8-3/8 In., Overall Length 12 In., For Use With Rapid Core Eject Arbors. This item has been restricted from sale in the following state (s): []