Material:Durable 304 stainless steel.Compared with normal stainless steel,it’s safer, more durable,non-toxic and corrosion resistant.It is of high hardness and not easy to deform. Size:M8 Package:30PCS High polished surface,no burrs. The enclosed dome can play a good role in decoration and to prevent being threaded scrape. Please keep it away from children. Quantity: 30 pieces Note: It does not include other things, the color is based on the first picture, and the other pictures only show the effect Due to the differences between different monitors, the picture may not reflect the actual color of the item. Due to manual measurement. Please allow deviation. Thanks!