This is the Horn Set for the Hitec HS-303 Sport Servo. FEATURES: Constructed of plastic. Heavy duty X-shaped design with four linkage holes per side. Fits the Hitec HS-303, or any servo with a 5mm diameter output shaft. INCLUDES: Two Horns for the Hitec HS-303 Sport Servo. REQUIRES: Mounting on servo shaft with phillips screw included with servo. SPECS: Output Shaft Diameter: 0.20" (5mm) Length: 1.73" (44mm) JXS 7/02/02 ir/kh