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The FAI Fin Jig is an inexpensive but efficient tool to aid with building the SK369 FAI Competition Model Kit. It allows you to attach three fins that are 1/16" thick on a BT-5 body tube. It also provides for an offset of the fins from the end of the body tube to allow for motors to be taped to the tube. It is 3D printed with the same smooth finish material that we use for our scale parts.