Good Connections M6 Mounting Kit, 20 pieces, for 19"/10" racks and wall distributors. Includes 20× M6 pan-head screws (20 mm, black) with matching M6 nuts (silver) and black plastic rings. The pan head has a hexagon/Allen socket. Suitable for installing patch panels, power rails, and other rack components. Typical materials: steel screws/nuts (possibly electroplated) and plastic rings. Complies with RoHS (according to the relevant directive).