Express Mach3 Stainless Steel 3 Blade Props for 90-300+hp Engines with 4.75 in. Gearcases. Stronger materials, more corrosion resistance, higher gloss and new casting technology. Includes Turning Point's cutting-edge designs. State-of-the-art casting technologies and race-proven finish and tuning practices to the Express line of props. Proprietary stainless steel, TP17. Performance tuned pitch, rake angles and exhaust vents improve all around performance. Propellers fit COX, Evinrude, Honda, Johnson, Mariner, Mercury, MerCruiser, Nissan, OMC, OXE, Parsun, Suzuki, Tohatsu,Volvo Penta, & Yamaha Outboards and Sterndrives. Uses 500 Installation/hub kits for applications under 200hp or 700 series Installation/hub kits for engines 200+hp. See application chart for engine application information and required Installation/hub kit part numbers. Why upgrade to a Tuning Point stainless steel propeller- Stainless steel propellers are much more durable compared to aluminum.- Substantial better performance over competitive aluminum propellers. (Minimal performance difference, around 0.5-1mph speed gain over Turning Point Aluminum Propeller Designs.)-.