-MERCURY & MARINER: Note1: Use 701 Super Duty Kit for 200+hp Engines.Note2: 115hp ProXS CT Only; For ProXS & Verado w/ 1.25" prop shaft, use Mercury Solid Hub kit with the Turning Point Prop. EFI CT / SeaPro : 90 to150hp / V6 & I6: 135 to 300hp /Verado 135 to 300hp(not HD) / OptiMax: 150, 200, 250hp MERCRUISER:Note1: Use 701 Super Duty Kit for 200+hp Engines. Note2: If propeller strikes trim tab, replace with Mercury part#822777A1Alpha One and Bravo One (83+). -Replace your propeller housing with Turning Points 11700100 MasterGuard Hub System Installation Kit #701 with 15-Tooth Spline Hub. This kit is compatible with Hustler and Express Series Propellers for select Mercury & Mariner and Mercruiser 200+hp 15-spline shaft engines with a 4.75" gearcase.