This multiuse wrench can be used with metric and imperial hex nuts. It also has a tapered end which might be useful as a flathead screwdriver or chisel. It is small enough to be attached to a keyring. Designed by Matt C. - grade 12 Drafting & Design student. We've printed ours using both ABS and PLA with 100% infill. The 1Up files are 1% larger than the original design and due to plastic printing tolerances, seem to work best.