This 15mm aluminum intake manifold & gasket set is designed for performance and fits almost any 2-stroke air cooled ATV, Dirt Bike, Pocket Bike, & Mini Quad up to 49cc. Also used for some 2-stroke scooters and smaller buggies/go-karts. Included is a performance 15mm aluminum intake & matching gasket. Opening is 14.5mm, the mounting holes are 4mm and 3.5mm apart centre to centre respectively.