Boat Outboard Propeller Spec:Diameter-14.25, Pitch-21,15 Spline Tooth,Rotation-Right,3-Blade Aluminum boat Propeller,Replaces Part NO.#:48-832832A45. Pls kindly check your Mercury/Mercruiser Alpha One propeller etc with the correct diameter/pitch/rotation/OEM NO#/engine year/ HP,make sure choose exactly propeller in need,High quality: Our 14-1/4 x 21 propeller for mercruiser alpha one is made by heavy duty aluminum make sure solid construction,heat-treated paddle blade has high toughness and durability,Function:Replaces original damaged 21 pitch Mercury/Mercruiser propeller,lower fuel consumption and great speed acceleration or rmps,reduce the wear and tear on engine,Easy Install:Just remove prop locknut&locknut retainer& forward thrust washer.Then Install forward thrust washer---Insert drive sleeve into prop---Slide prop on prop shaft---Insert drive sleeve adapter--Slide locknut retainer---Install prop locknut---Insert sth to prevent spinning--Tighten prop locknut(NOTICE: The Boat Propeller NOT Includes Flo-Torque hub kit),Fitment:perfect 3 blade boat propeller replacement for 14.25x21pitch Mercury Engines Outboards 135 150 175 200 220 225 250 300HP&Mercruiser Alpha One Bravo One Stern-Drives,detail information pls see below