These 10 piece allen wrench key sets are wonderful for my in car tool set that I am putting together. There have been many a time I needed one and of course they don't come in standard tool sets! So I put my own together and got these to put in it! Now whenI nned to take apart a door to fix my window or anything else that requires an allen wrench I will not only have on but I will have the size I need! These are on a ring to keep them all together and are well constructed!