Powertech OFS blade style is similar to the Mirage Saltwater Series, designed for V-bottom off shore style boats, I/O applications, high performance tri-toons and boats over 3500lbs.The OFS has a constant 15.25 inch diameter, regardless of pitch. It is available in every inch of pitch from 14-28, right & left hand rotation. Powertech Offshore Propellers are available with the Powertech Premium Cushion Lok Hub design or Square Hub to receive the Vortex/Flo-Torq hub kits.