Very popular, 2.4mm to 2.92mm adapters are common in test labs. Both the 2.4 and 2.92 are precision connectors. 2.4's are rated to 50ghz, 2.92's to 40 but are useable to 46ghz. These 2.4mm to 2.92mm coaxial adapters have stainless steel bodies. 2.92mm to 2.4mm adapters use metric threads for the 2.4, english threads for the 2.92.