Hole Saw Arbor, Shank Size 3/8 In., Shank Shape Quick Change Hex, Fits Hole Saw Dia. 1-1/4 In. to 6 In., Thread Size 5/8-18, Replacement Pilot Drill No. Mfr. No. G7598507, Material Carbon Steel, Pilot Drill Size 1/4 In. dia. x 3 In. L, For Use With Bimetal Hole Saws, Includes Pilot Drill Bit, Turn-in Drive Pins