Toby, That is not a question we can answer without knowing what specifics. The most important piece of information missing is speed. How quickly do you need to lift something? A high ratio gearbox in theory gives more torque than a low ratio gearbox but it does its work more slowly. If you want it quicker, then a lower ratio gearbox is needed but will need a more powerful motor . In summary, if you can advise the torque needed at a particular rpm then we can further advise. Regards Support

Stephen, The drawing on the product page shows that the tapped holes on the front face are M2 x 4mm deep. Overall length depends on the thickness of the angle bracket you use. Again from the same drawing, it shows the shaft as 4mm diameter, the bevel gearbox are 5mm shafts so you simply need a 4-5mm coupling. However, we do stock stock a 4-5mm coupling but you could always get a 4mm coupling and bore out one side to 5mm.