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Mid Pin Hybrid Foil rudder by SmartTrack for Tandem Kayaks. Best used as a replacement rudder on any two-man kayak that is outfitted for a Mid Pin style rudder. The pin is 1 and 15/16 inches long with three levels of Rudder Pin Ring holes. The blade is 21.5 inches long in total length, 4.25 inches at the widest. Use this link for Hybrid Rudder Instructions. MPRDR