JW Winco Type K Glass Filled Nylon Plastic Blind Hand Knob with Thread Insert, Threaded Hole, 1/4"-20 Thread Size x 15/32" Thread Depth, 1-17/64" Head Diameter (Pack of 1) Hand knob with fluted head style Molded-in zinc plated steel tapped inserts Black matte finish Made of glass filled nylon plastic RoHS compliant