Turning Point Express Mach4 - Left Hand - Stainless Steel Propeller - EX-1417-4L - 4-Blade - 14.5" x 17 Pitch [31501741]Express Mach4 Left Hand Stainless Steel Propeller EX 1417 4L 4 Blade 14. 5" x 17 Pitch 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 propeller with two different blade shapes (they call it Dual Geometry) for 90 300+hp applications. This prop is uniquely engineered with two blade geometries: (diagram label 2)two blades utilize the Hustler