The 2.92mm to sma adapters below have BeCu fenmale contacts and stainless steel bodies. These SMA to 2.92mm adapters may seem superfluous as 2.92’s mate with sma’s. if the sma is slightly out of spec it will damage the 2.92; sma’s have Teflon dielectrics & the pins mate first, 2.92’s have air dielectrics & the threads mate first. We always recommend sma to 2.92mm adapters as connector savers. The frequency is of our sma to 2.92mm adapters is set by the sam to 27Ghz.