Time-sert repair kit tool RENTAL, size 3/8-16, coarse: kit includes the correct drill bit,a cutter, insert tap and installer & 2 long inserts for you to use. Comes with instructions. will allow to fix head sender temperature switch, manifold studs, rear engine studs, engine head studs in block, bolts in bell housing. Included in the rental price is a core charge of $83 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.