Review on Pieces Stainless Bolt Dropper Insert by Tyrone Narvaez

They've been broken in the worst way possible. As others have pointed out, most work well up to the nylon section, after which they bond irreversibly. I destroyed (broke) three bolts before I gave up completely. There was only 1 successful one, which I also took out of principle. Even with a broken stem, it takes a lot of strength to fix a stuck locknut on a 5/16" bolt. A trip back to Lowe's for the usual nuts and lockwashers interrupted an otherwise productive project. Grrr.