Turning Point Express Mach4 - Left Hand - Stainless Steel Propeller - EX-1423-4L - 4-Blade - 14.3" x 23 Pitch [31502341]Express Mach4 Left Hand Stainless Steel Propeller EX 1423 4L 4 Blade 14. 3" x 23 Pitch The Prop that put the "four" in Performance! Turning Point's Four Blade revolutionized the aluminum propeller market when introduced over 6 years ago. No one had ever produced an aluminum 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: two blades utilize