New blade design is up to 20% more efficient than previous models Use of Duplex 2507 for the blades allows a very thin cross section, while retaining great strength Body components cast in 316L "O" ring seals on the blades and main gear hub to prevent loss of grease Simple screw and locknut pitch adjustment can be adjusted easily, even while in the water Independent ahead and astern pitch adjustment, allows optimum ahead pitch and fine reverse pitch for maximum thrust and minimum "prop walk" Dual blade bearings support the blade either side of the gear for increased rigidity Oversize dowels locate blade assembly and transmit driving torque 6 x 8mm cap head screws lockwired in place for security provide a very robust construction Sacrificial zinc anode tail cone with stainless steel core. A single Nylok nut makes in water replacement easy Dual permanently fitted grease nipple/"zerk" lubrication points, enables easy in water lubrication of all bearing areas (required annually)