The Michigan Wheel Marine 9 7/8 X 14 1/4 A3R PROP designed to alleviate impact and gear shift stress has a NAVAL brass spindle with a rubber-padded hub. In the case of a severe accident, the rubber bushing is constructed to spin free, lowering the risk of unit damage. WARNING: California Proposition 65 APPLICATIONS FOR NISSAN, TOHATSU: 1986 - 2001: 25 HP 2002 and Newer 4-Stroke 25 HP 1985 - 2001 30 HP TLDI 2016 and Newer 30 HP 2002 and Newer 30 HP 4-Stroke APPLICATIONS FOR MARINER, MERCURY: 1980-1984: 25 HP 1976 - 1979 28 HP From 1979 until 1990, 30 HP was available. Key features: The bushing has been strengthened, and the powder coating has been enhanced. Specifications: Dimensions: 17 x 17 x 9" Diameter: 9 7/8 Rotation: Right-Hand Number of Splines: Rubber Hub Bushing 10 Splines Brand: Michigan Wheel Marine Horse Power: 25- 30 Horse Power (4- stroke) with ten tooth spline, Nissan, Tohatsu 25-30 HP with 3" Gearcase