The Michigan Wheel Propeller has a 10 diameter Three Blade Aluminum 10 X 9 Right Hand Rotation. This propeller has a NAVAL Brass spindle and a rubber-cushioned hub to absorb impact. Key Features: The factory-installed rubber hub eliminates the need for a hub kit Precision-balanced blades High gloss black powder coat finish. Aluminum alloy for strength and durability A metal spindle with a rubber-cushioned hub from NAVAL absorbs impact. Enhancements to the powder coating and a beefier bushing Rubber bushing that is intended to spin freely in the event of an intense collision 8-tooth spline through-hub exhaust Recommended Boat Applications: Offshore Singles, Pontoon, Ski boats, Family Cruisers, Workboats, Houseboats, Inflatables, Aluminum Consoles, Walleye Boats. Fits Application: Mercury Mariner 20 HP 1963-1981 (Includes Merc 200 / Merc 20) Specifications: Brand: Michigan Wheel SKU: 032136 UPC: 014984004947 Weight: 4.13 LBS Material: Aluminum Pitch: 9 Blades: 3 Spline: 8 Tooth Spline Diameter: 10 inch