The 242125 is a N-type Jack to SMA Jack Straight Adapter with gold-plated beryllium copper contacts. Body made up of brass with nickel-plated finish and PTFE insulator. This adapter is commonly used in applications requiring 2 dissimilar RF interfaces to be connected. Connex between series adapter is used to join two connectors of different series. They are designed to offer the lowest VSWR rating of the two series involved.