Specifications: Driven unit: Diameter 6" (157mm) with 5/8" bore Drive clutch bore: 19mm (3/4") Belt: Asymmetrical type Belt Top width: 19mm(3/4") Sprocket teeth: 10 teeth or 12 teeth Engagement range: 2350±200 RPM Recommended engine: 5.5HP - 9HP engine, 3/4"shaft with flat key The Torque Converter assembly includes: Driver Unit:1set Driven Unit:1set V-Belt:1pc Driven Shaft & Gear:1set Side Retainer Plate:1pc Torque Converter Cover:1pc All necessary nuts, bolts, and washers to mount