E/M~NMO to N Female Adptr /10 Basestation conversion adapter for Ground Plane IndependentAntennas (GPI). Frequency independent operation for all NMO type antennas Rugged All Brass construction with Bright Nickel Plating. Integrated NMO Sealing Surface eliminates ingress potential between antenna and mounting surface or bulkhead. Integrated bulkhead O-ring seal to protect Electrical Enclosures. Mounts up to 11/32 in. surface thickness. Sold in 10 Packs