This is a landing gear for rc planes. Use either in front or back of the plane. About 20 cm wide and 13 cm high. Holes for wheels are 2mm wide, holes for wires for suspension are there too. The suspension work great, though it could be a bit more feathery. It's designed to work with 35mm wheels that can be attached with some bend wire and be held in place by some PTFE tubing as end caps.