This is a Heavy Duty (22ga) 6" Servo Extension designed to fit many servos on the market including JR, Hitec, Spektrum, and most other brands (except Futaba) servo plug. Almost any servo will plug into this extension, except Futaba. This extension will plug into almost any receiver, including Futaba, but care must be taken to plug into a Futaba the correct direction as it doesn't have the polarity plug on the Futaba style plug.