These screw protectors were the perfect diameter for my #10 screws. Although they are a little long for my purposes, they are easy to cut. Shipping was quick and they were well packaged in a zip lock bag making it easy to use a few then close the bag up to save the others for later. The material is thick but easy to install over the screw threads. The price was great. I use these to cover the threads of screws inside of a mold. The screw protector stays in the molded product when I remove the screw after the molding compound has set. They act as an extender for the insertion of a screw into the molded product. But they also act as a shield from the molding compound getting into the screw threads making it hard to remove the screw once the molding compound has cured. Obviously I can't reuse these.