The Reinz Cylinder Head Bolt Kit - 137997 is a comprehensive kit of products designed specifically for use in cars. It contains all the necessary components to properly service the cylinder head bolt of a car, ensuring optimal performance and longevity. The kit includes various types of bolts and fasteners, as well as gaskets, seals, and other essential parts. The specific contents of the kit may vary, but generally it will include all the necessary items to properly secure and maintain the cylinder head of a car. This kit is an essential tool for any car owner or mechanic looking to properly service and maintain their vehicle.