Big-Autoparts Motor Impeller For Mercury 4HP 4.5HP 7.5HP 9.8HP 47-89981 47-65957 18-3039 Boat Engine Warranty: 2 years; No. Blades: 6;Depth /Height/width :14.48mm; Outer /External impeller overall Diameter: 32.00mm;Internal shaft insert /Hub Diameter : 11.61mm;Net Weight: 12g; Material: Impeller(CR), Shaft Sleeve (Brass) This aftermarket Impeller replace Mercury Mariner outboard motors 47-89981 / 47-65957, 18-3039.OEM part for references only They are similar in design to stock OEM units and require only simple hand tools for installation OE level quality and durability.100% compatible with OE parts. TS16949 certified manufacturer Package: One Outboard Motor Impeller