2.92mm adapters are precision parts, with air dielectrics, & the outer conductor mates before the center conductor. We offer 2.92mm to 2.92mm adapters with various vswr options. The right angle 2.92mm adapters parts below are actually a swept line inside the rectangular housing. 2.92mm adapters are also known as "K" adapters, there used to be a very small difference between 2.92 and K's, but we believe parts built to the newest standards will be the same. Our 2.92mm adapters have BeCu female contacts.