These high quality parts are the 8 mm exhaust pipe nuts for performance exhausts from NCY The standard 8 mm thread diameter is used when you are installing a big valve head or large diameter exhaust pipeDescription These high quality parts are the 8 mm exhaust pipe nuts for performance exhausts from NCY.The standard 8 mm thread diameter is used when you are installing a big valve head or large diameter exhaust pipe. These exhaust pipe nuts are an essential component.The 10 mm external diameter head allows for extra clearance between your wrench and the pipe for easy access. This all but eliminates dropped wrenches, skinned knuckles, and a lot of those words that your mother would not approve of you using.Let Monster Scooter Parts be your source for NCY scooter parts and accessories. ? WARNING California Residents: Proposition 65 Warning