The three most popular frame attachment hooks on one cluster. Transport Grade-70 R, T and mini J hooks were designed to work with the reinforced oval frame holes found on all types of vehicles. The R hook is the most secure way to transport a vehicle on your carrier, trailer or flatbed. The forged mini J hook is a fast and easy way to attach the cluster to most import vehicles with front tow loops. The T hook fits in all of the same frame holes as the R hook.