Turning Point - Express Mach4 Stainless Steel Propeller - Right Hand - 4-Blade - 13.25" x 17 Pitch - EX1/EX2-1317-4 - 31431730Turning Point Express Mach4 Stainless Steel Propeller Right Hand 4 Blade 13. 25" x 17 Pitch EX1 EX2 1317 4 31431730 The Prop that put the "four" in Perfourmance! Turning Point's 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,