It is quite common for manifold studs to break when their nuts are being removed for engine & exhaust repairs, this is often due to corrosion. The studs & nuts go through thousands of heat cycles over the life of the engine & often the studs can shear due to the continual expansion & contraction of the head, manifold & studs as the engine heats up & then cools down. The kit contains 100 assorted engine manifold studs/nuts suitable for both inlet & exhaust manifold made up of the most common M8 & M10 sizes. The studs are threaded at both ends with the outer/longer thread able to be cut to length where the application requires it to be adapted. The selection of nuts provided include copper flashed steel (anti-seize coating) & brass nuts. The brass nuts offer excellent anti-seize & corrosion qualities at high temperatures but require a bigger hex size for M10 thread sizes than copper flashed steel. For the removal/installation of manifold studs use Laser Stud Removal & Installer Kit, Part No. 7804.