M3 x 20mm Socket Button Head Screws (ISO 7380) - A2 Stainless Steel Metric Socket Button Head Screws, also known as Dome Head Screws, feature an internal socket drive, and are fastened with a Hexagonal\/Allen key. Their Low Domed Head offers an attractive finish, as well as a wider bearing surface. These Socket Button Head Screws are made from A2 Stainless Steel which provides corrosion and oxidation resistance. For larger quantities or items not listed, please email and one of our team will provide you with a quotation. M3 x 20mm Socket Button Head Screws (ISO 7380) - A2 Stainless Steel