The RCA-2C is our second bestselling RCA plug. With its machined one-piece body and pure copper center pin, it can be used on the finest interconnect cables. We use it with our BL-1 interconnect. The cable entry hole of the RCA-2C is 6.0 mm, allowing it to comfortably accept cables up to 5.6 mm. A set screw under the barrel provides dependable strain relief.