Abstract: A radio frequency cover and complementary shaped hole that securely fit together to provide electro magnetic and electrostatic shielding of adjustment access holes. The cover preferably is cold headed and the complementary hole is either stamped, machined or cast for inexpensive mass production. Each cover preferably has a socket or slit on its top surface to receive and be guided by a tool, which also secures the cover in an access hole within a second access hole in radio frequency and/or electronic systems. The covers include self tapping thread formers to further reduce manufacturing time and costs.