Drive: 3/8" Square DriveOverall Length: 2"Shank: 1/4" HexMaterial: Black Oxide Coated Heat-Treated SteelStrength To Withstand Up To 2,000 in. lbs. Of TorqueFits All Impact DriversFor Use With 3/8" Drive SocketsUse With Sockets For Fast, Easy Driving Of Nuts, Bolts And Hex Head ScrewsAdds Versatility To Any Power Drill By Converting It To A Socket Driver