www.microwavejournal.com/articles/31282-5-mm-and-7-mm-precision-adapters

3.5 MM and 7 MM Precision Adapters
October 29, 2018
RF Superstore recently announced the addition of 3.5 MM and 7 MM Precision Adapters to its extensive inventory of in-stock RF adapters and connectors.
MW Journal subscribers can enter code MWJ201810 to receive 20% off a single order through November 30, 2018. Click here.