Never opened. Still in original package. https://www.amazon.ca/Davis-Instruments-Doel-Fin-Outboard-Stabilizer/dp/B0014490TS/ref=sr_1_1?dchild=1&gclid=Cj0KCQjwtMCKBhDAARIsAG-2Eu8tEmcr2ugtJ5Gh7DX0nKjWd6FUYiWN6Oxphaa6Jm-GIH62uy9_MD0aAmwrEALw_wcB&hvadid=442582461059&hvdev=c&hvlocphy=1001973&hvnetw=g&hvqmt=e&hvrand=10744898654121480140&hvtargid=kwd-492717565592&hydadcr=15665_10263668&keywords=doel-fin&qid=1632718055&sr=8-1