DuraTrax SX501WP Servo Digital Waterproof FEATURES: Digitally enhanced microprocessors shorten response time from transmitter input to servo reaction Universal connector Metal gears;INCLUDES: Duratrax SX501WP Servo 0.83 (21mm) Round Horn 1.5 (38.5mm) Four Point Horn 1.2 (32mm) Six Point Horn four each Grommets Eyelets and Mounting Screws 2x5mm Servo Horn Screw;SX501WP Servo Digital Waterproof