For use in FRESH WATER. Compatibility Fits all Flexofold 2-blade (with open gearing) propellers for saildrive. Description 1 pair of aluminum anodes for use on Flexofold propellers in fresh water. Net weight = 25 grams (pcs). Includes mounting screws pre-applied with Dri-Loc®. Mounting Tool needed for mounting: Allen wrench, 5 mm. The Dri-Loc® is usable for mounting above as well as under water. For further information, please download mounting instruction for your specific Flexofold propeller. NOTE: If reusing any screws pre-applied with Dri-Loc® after they have been mounted once, threadlocker must be applied to the screws again. The function of the Dri-Loc® only works once. We recommend using Loctite® 243 Blue Medium Strength Threadlocker.