Billet Aluminum anodized spark plug wire separators for 8mm, 9mm, and 10mm wires. These clean up the look of your engine and also allow you to more precisely control the routing of the wires. Can also be used to pull the wires tight to keep them from getting too close to the exhaust manifold, header, or turbo to prevent melting. Available in bare aluminum or anodized red, black, or blue. Use at least one kit for 4 cylinder applications and at least two kits for V8 applications.