Spark plug Time-sert repair kit tool RENTAL: kit includes the correct drill bit,a cutter, insert tap and installer & 1 correct copper insert for you to use. Comes with instructions. will allow you to repair one spark plug hole. Included in the rental price is a core/deposit charge of $ 155.00 that you will get back, providing you return the kit minus the insert to us complete in good condition within 30 days. If you need more inserts, you can purchase them separately, they are available in the " tool rental & misc." page.