Boat Tools Drive Shaft Adapter Holding Tool Fit for Mercury Marine Mercruiser MC-1 R-MR Alpha One Alpha 1 Gen II Drive Units Upgraded Drive Shaft Adapter Holding Tool Spline Tool Fit for Mercury Marine, Mercruiser MC-1, R-MR, Alpha One, Alpha One Gen II drive units, Replace OEM 90220 18-9854 91-56775T Product Description dwt:YMT Number of Pieces:1 Pcs/Set Material: Steel Item Weight:7 ounces Color:Black Item Package Dimensions L x W x H:2.05 x 1.65 x 1.61 inches Manufacturer Part Number:#90220, 18-9854, 91-56775T Package included:1*Drive Shaft Adapter Holding Tool APPLICATION: Perfectly applies to Mercury Marine Outboard engine with 13 splines driveshaft, Mercruiser MC-1, R-MR, Alpha One, Alpha One Gen II drive units. MATERIAL: Made of premium heavy duty steel material, through hardened processing for excellent strength and toughness, anti-wear, rust resistance, anti-oxidation, sturdy and durable. FunctionThis Drive Shaft Adapter Spline tool provides a wrench surface to turn the drive shaft on MC-1/Alpha One/Alpha One Gen II drive units. Replacement: Replaces OEM Mercury #91-56775T, Sierra #18-9854, GLM #90220 and Mallory #9-79809. A MUST-HAVE replacement that meets or even exceeds OEM standard in function, performance and quality. Satisfaction Guarantee If you're not 100% satisfied with our products, simply return it in 30 days for a full refund, with unconditional refund guarantee and 12-month warranty.