Z-Drive III Outdrive in all black (see picture 1) -Specifically designed for scale applications. This comes from a small European manufacture with no instructions, so this is for a more advanced builder. -All aluminum case. -Adjustable drive angle.-Gear driven with a small piece of flex cable to align to the motor(see picture 6). Specs:Drive Size: See picture 4Mounting Bracket Size: See picture 5. Prop shaft: 3/16" (4.75mm)Comes with both a left and right flex cable for left or right props.Suggested use: Boats in the 25" (640mm) - 35" (875mm) range. Requires:36mm x 50mm Motor with 5mm shaft. 15,000-20,000 maximum rpm NOTE: Comes in all black. Gray pictures are for reference only. If you are looking for top speed, we suggest a traditional inboard motor with a transom mounted strut. Operation Instructions: This item ships without oil in the case. It is necessary to fill the gear case with a oil similar to 75W90. Picture 4 shows the area to add oil. We suggest replacing the oil after each days use.