function openWindowCustom(url, name, param) {popupWin = window.open(url, name, param);popupWin.focus(); };Expect good acceleration and all-around performance from Rubexs 40-140hp Four-Blade Stainless Steel Propeller. Durable stainless steel provides greater strength. Large ear-blade design adapts to a wide variety of applications. Use with compatible Rubex Hub Kit (sold separately). Available: 15 Pitch 13.25 dia. 17 Pitch 13 dia. 19 Pitch 13 dia. 21 Pitch 13 dia. Cancer and Reproductive Harm- www.P65Warnings.ca.gov. Type: Stainless Steel Props.