flamewheel clone whirlwind FY450 16mm tube arm holder mount

In case you want to replace the plastic arms on your copter frame with 16mm carbon fiber or aluminum tubes.
Fits my "whirlwind FY450" clone frame from HK, probably also others but I am not sure about the hole pattern of those.
Because the holes of the upper and lower frame piece are not exactly in line, the two holes are tilted so that you can still use 3mm bolt through - holds the arm just fine only with the two bolts, I also use ziptie throuht the two central holes (see image).

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