This pair of high quality scooter parts are the 6 mm exhaust pipe nuts for the performance exhausts from NCY The 6mm (internal thread size) acorn nuts are especially useful on NCY’s exhaust pipes and kits for scooters sporting 50cc enginesDescription This pair of high quality scooter parts are the 6 mm exhaust pipe nuts for the performance exhausts from NCY. The 6mm (internal thread size) acorn nuts are especially useful on NCY’s exhaust pipes and kits for scooters sporting 50cc engines.Let Monster Scooter Parts be your source for NCY scooter parts and accessories.0500-1048 ? WARNING California Residents: Proposition 65 Warning