M4 x 5mm Socket Countersunk Screws (DIN 7991) - A2 Stainless Steel Socket Countersunk Screws feature an internal socket drive and are fastened with a HHHHexagonal\/Allen key. The slanted neck and flat top allow for Socket Countersunk Screws to lay flush with the fastened surface or raised when paired with a Cup\/Countersunk Washer. These Socket Countersunks 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. M4 x 5mm Socket Countersunk Screws (DIN 7991) - A2 Stainless Steel