TFL Aluminum and carbon fiber outboard unit. Similar in size to an OS or K&B 3.5. Carbon-fiber prop wash/cavitation plate. 2 grease fittings for ease of maintenance. Both the height and drive angle can be adjusted for optimal performance. This outboard is sized for a 1-3 pound hull and can be fitted with a brushless motor in a 3650, 3660, or 3674 motor or OS Nitro engine. The brushless motor can be mounted directly to the lower unit. Includes:(1) Outboard Unit(1) Coupler for 5mm motor shaft.(1) Metal 44mm PropOptional TFL SSS 3674 2000kv motor with a water jacket. This is a user-installed option Specs:3/16" Prop Shaft. 9 Ounces.Fits up to 47mm diameter PropMotor screws: M3 x 8mm for 3674 motorNote: We suggest using the linkage rods from part # tfl-519b81a. The rods will thread into the ball ends that are included with the outboard unit. Requires a motor with a 5mm diameter shaft and 25mm motor hole spacing. For example, Leopard 3650, 3660, or 3674 series motors. We recommend this outboard for 30,000 rpm or less.