TFL In-Outboard Drive System . Suitable for 28/29 mm Diameter Brushless Motor (Max 2800kV) Motor Direct Mount to it and NO NEED to install addition Rudder. 4mm Shaft Shaft and Adjustable Prop Out angle. c/w 35mm Copper 2 Blade Prop (Max. 36.5mm) Fully made in Al Alloy Length 14.5cm (11cm OutBoard) x Width 5cm x Height 10cm Outboard Opening Hole W 35mm x H 45mm Weight 189g