Rear Low Arm-Hard (H)

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~~Description:
 New Hard formula Rear low arm for R8.0/R8.0 2016/ R8.0E,
 (H) arm not only harder and also lighter(2.3g), stronger then standard arms.
 Hard rear low arm width come with 0.3mm wider then standard arm,
 Please file and fix the width before assemble.
 Before assemble H arm , apply oil inside the screw hole to reduce stress of screw