M10 x 40mm Socket Button Head Screws (ISO 7380) - High Tensile 10.9 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 10.9 High Tensile Self-Colour Steel. For larger quantities or items not listed, please email and one of our team will provide you with a quotation. M10 x 40mm Socket Button Head Screws (ISO 7380) - High Tensile Steel 10.9 Self Colour