Three Zip Ties

4" (35mm) Double Arm Horn

Hardened Steel Drive Cups Nylon 12mm Wheel Hexes

Wing and mounting hardware

Dubro 673 Heavy Duty Servo Arms Standard Futaba J (8) Shocks Three Zip TiesDubro 673 Heavy Duty Servo Arms Standard Futaba J (8) For those requiring a really heavy duty servo arm, the Dubro "Super Strength" arms will fit the bill. Features: Black, fiber reinforced composite plastic servo arms. Includes: 4 short, 2 long servo arms that extend in one direction from the servo center; one long arm that extends in two opposing directions from the servo center, and one 3 arm horn. Specs: Short: Mounting holes at: 7, 10 and 12mm.