Defender Security E 2434 Replacement Spindles, 3/8 in.-20 x 3-1/2 in., Used On Antique Style Door Knob Systems, Pack of 10 Zinc diecast construction 1/4 in. drive with threaded shaft For antique style knob systems 3/8 in. - 20 threading at 3-1/2 inches long Pack of 10 spindles