Teflon Insulator, O-Ring, Gold Plated Contact and Connection Cover Perfect for Repair of a Broken Mount or To Make Your Cable Own Assembly Simply add coax and you have a new NMO Mount O-Ring weather protection on ring. Easy solder attachment Dave's Hobby Shop - by W5SWL INSTALL TIP - NMO MOUNTS PHYSICALLY INSTALL FROM OUTSIDE THE CAR BODY, NOT THE INSIDE Replacement NMO mount, designed to use a 3/8 inch hole. Brass with a Gold plated contact pin. Teflon insulator. Ready for you to supply the coax. Perfect to replace a damaged mount where you already have the coax installed. Brand new - excellent quality. Quantity: One Mount.