This is a plastic bolt that grab my convex glass shower door to tighten the glass to the glider. Original one broke apart after a few month of usage and manufacturer do not provide them as spare parts. You must replace the whole doors !!! So I designed them with 123D Design. It is rough design but still, they fit & work perfectly !I precisely measured original but broken one, and rebuilt it step by step. 3 tries until the printed one fits the shower door. Et voila.