This is the kit shown on YouTube (https://www.youtube.com/watch?v=DNHeJlySJPs) to convert your Flip FPV into the Racing Edition. There are TWO sized holes provided - you only need ONE. Use the parts labeled (5mm hole) if you want to install 3mm brass inserts. Use the parts labeled (3mm hole) if you want to self-tap 3mm screws. Just don't over torque them... I'm also including a 0 degree spacer if you like the "gills", but don't want the 20 degree forward tilt on the arms. You will need 12 M3 x 35mm hex head screws to attach these arms.