Time-sert repair kit tool RENTAL, size 1/4-20, coarse: kit includes the correct drill bit,a cutter, insert tap and installer & 2 short inserts for you to use. Comes with instructions. will allow to fix oil pan bolt threads, valve cover bolts and some shroud bolts. Included in the rental price is a core charge of $66.00 that you will get back, providing you return the kit minus the 2 inserts 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.