Yamaha Y Series Saltwater Series II Stainless Steel Propellers features the following: Large diameter blade design Aggressive rake and an extra cup Superior fuel efficiency Shift Dampener System (SDS) - propeller hub that is designed to eliminate the heavy thud or "clunk" often heard when shifting from neutral to reverse or forward Yamaha 6GR-45970-10-00 Y Series Saltwater Series II Stainless Steel propeller specifications: Diameter - 17.125 inches Pitch - 15 inches Blades - 3 Rotation - Right Hand Material - Stainless Steel Hub - SDS This Yamaha Y Series Saltwater Series II Stainless Steel propeller is intended for use on 5.25" gearcases and is applicable with the following engine models: Yamaha 5.6L XTO Offshore V8 Outboard Models