Scale Outboard. Features a completely metal lower unit, including steel gears, for enhanced durability. Includes: Everything in the picture. Specs: Length: 138mm (5.43") Width: 47mm (1.85") Height: 170mm (6.69") Weight: 204.12 (7.2 Oz) Shaft: 3.175mm (1/8") Requires: Motor with 5mm diameter shaft and 19mm motor hole mounting spacing. Suggested Motor flh-d3548. Prop for 1/8" shaft, this unit will fit up to a 40mm diameter propeller. Steering linkage, hh-817, 4-40 rod, and OSE-83106. Notes: This is designed for scale boats in the 25" (650mm) to 35" (900mm) length range and 3-5 pounds total weight. The manufacturer suggests a flh-d3548-41100 motor on 3s to 5s. If your boat falls within those specs, we suggest a 90amp or greater. Click for Instructions and a Diagram