Turning Point 11500500:Turning Point Propellers MasterGuard Installation Kit 505 (11500500)MasterGuard 500 Series Installation Kit for Engines with 4.25" or 4.75" GearcasesLifetime warranty for engines under 200hp with aluminum or stainless steel props and engines 200+hp with aluminum props only.MasterGuard Installation/Hub Kits carry the only Lifetime Warranty in the WORLD!Hubs have no warranty restrictions, except for extreme commercial use.Saves a boater up to 33% on replacement propeller purchases (need to purchase prop housing only).One piece design: durable marine Bronze with Over Molded Glass Filled Nylon for Long Life.Re-useable after a Prop Strike.Warranted even if the prop is Destroyed! (consumer normal use only, not applicable on commercial applications)Enhanced lower unit protection.