Turning Point Express Mach4 - Right Hand - Stainless Steel Propeller - EX1/EX2-1315-4 - 4-Blade - 13.5" x 15 Pitch [31431530]Express Mach4 Right Hand Stainless Steel Propeller EX1 EX2 1315 4 4 Blade 13. 5" x 15 Pitch The Prop that put the four in Perfourmance! Turning Points Four Blade revolutionized the propeller market when it was introduced. No one had ever produced a state of the art Swept Cleaver design for 40 150hp applications. These props re wrote the rules, proving that you can run a four blade that has unprecedented hole shot, handling, and rough water stability