M2.5 x 4mm Socket Button Head Screws (ISO 7380) - A2 Stainless Steel 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 custom sizes, please email and one of our team will provide you with a quotation. M2.5 x 4mm Socket Button Head Screws (ISO 7380) - A2 Stainless Steel