1、No Residual Burr: Our accessories have uniform pitch, apparent threads, no residual burr, fixed threads, can get a great grip and very stable performance. 2、Security and Environmental Protection: Our hex screw nuts are no pollution and environmental friendly. No harm to human body. 3、Improve Efficiency: When the shaft of the fastener is fully inserted into the threaded hole, you need to use this type of screw nut, which can help you go to fix better and improve efficiency. 4、304 Stainless Steel Material: This hex screw nut set is made of 304 stainless steel, which is rust free, oxidation resistance, corrosion resistance, acid and alkali resistance, and high hardness. 5、Wide Application: Our accessories are suitable for door handles, lights, locks, toys, plumbing, and all kinds of machinery, electronic products, household electrical communication products, etc. around the store, garage or home.