Styled roughly after old Amphenol sockets. Black phenolic body, one piece gold plated knife contact solder lugs with double holes, press-fit nickel plated metal saddle. Fits through an approximately 1.140" hole in the chassis, 1.581" screw mounting centers but the elongated holes allow for wide latitude of adjustment. Good socket for 6V6GT, 6L6GC, 5881, 6SN7GT, 6SL7GT, 5U4GB, 5Y3GT and other octal based guitar amp tubes.