These Type N Bulkhead and Flange adapters are useful when mounting to enclosures or metal walls. We offer both Precision Type N Flange adapters and N Bulkhead Adapters good to 18ghz, as well as standard Type N adapters good to 11ghz. Also offered are Hermetic N bulkhead adapters. All our N Flange Adapters have 4 mounting holes. Our N Bulkhead Adapters and N Flange adapters are available in various vswr grades.