【Safety & Eco-Friendly】 DAFUNY M6 screws and cage nuts use black zinc plating, which is environmental protection and non-poisonous. In the process of using, there are no toxic substances releasing, which will ensure your safety. 【Standard Metric】DAFUNY M6 rack screws accord with standardized metric system. And the average error is less than 0.01mm. The screws thread is very sharp, clean and accurate without burr. The compact and force uniform screw thread is not easy to out of shape and slid in the process of rolling and installation. The deep and clear flat cross head can make your working more easily and improve your work efficiency. 【Product Content 】 20 pack x M6 Cage Nuts ; 20 pack x M6 Pan Head Screws ; 20 pack x Washers ; 20 pack x Gaskets ; If these rack mount screws don't live up to your expectations, please let us know. You take NO RISK when you purchase with us. But we're betting you'll fall in love with these rack screws , and a team of wild horses couldn't get them out of your hands and make you send them back. You'll probably order MORE!