Quick Change Hole Saw Arbor, Shank Size 3/8 In., Shank Shape Hex, Fits Hole Saw Dia. 3/4 In. to 1-3/8 In., Thread Size 3/8-20, Material High Speed Steel, Pilot Drill Size 1/4 In. dia., Overall Length 7-1/8 In., For Use With Bimetal Hole Saws, Includes Pilot Drill Bit
I was waiting for this tools & home improvement for a long time, but I am very satisfied with Spyder Arbor,Hex,3/8In,0.27PilotDrill Model: 600637H!