Holland's G-PF-59 push on F adapter is designed specifically for installers or technicians who are constantly connecting and disconnecting signal level meters, signal generators, spectrum analyzers, and other test equipment. Rated for over 5000 insertions, this quality adapter is truly a work of art. Although the initial investment on these adapters is higher as compared to standard economy push-on adapters, this quality adapter will outlast hundreds of the standard economy push on adapters.