I made these little wings to grab on to nuts for 1 8th of an inch bolts. As is they are usually snug enough for the wings to stay on semi-permanantly. If you really clean out the interior, it is loose enough that it can work as a semi-disposable mini-wrench (So you can keep them everywhere). So far, I have 1- a normal wing style 2- a tall narrow style for when the nut goes in a tight space and the wings get in the way more to come? If you have ideas, suggest more models and I will make them.