HN6064BA New Main Gear Case Set-Black Please note this new one way bearing and shaft works only with the new Autorotation gear H60020A Instruction: ●New design of one-way bearing. ●Use for T-REX 550E/600E/600N. Specification: ●One-way bearing HF1216 x 1(Φ12xΦ18x16mm) ●Main gear case x 1 ●Hex socket salf tapping screw x 5(T3x7mm) ●One-way bearing shaft x 1(9x12x34.7mm) ●Washer x 1(11.5x18x0.8mm)