Metric Coarse Class 8.8 High Tensile Hex Head Set Screws (Full Thread) are supplied with a Spring Washer & standard Flat Washer up to and including M10 diameter and M12 and over are supplied with a Spring Washer & High Tensile Flat Washer. Included washers are supplied at no extra cost. Supacheap Bolts Hexagon Head Class 8.8 High Tensile Set Screws are manufactured to Australian Standard 1110 and our bright zinc plated finish offers corrosion protection and are suitable for general purpose higher strength internal and external bolting where maximum adjustment may be needed, and for fastening blind threaded components where a thread, running the full length is required. Typical applications for this very widely used product include steel fabricators, machine builders, automotive applications and the construction industry. Supacheap Bolts currently stock M5, M6, M8, M10 and M12 diameter set screws up to 50mm in length for certain diameters. Please note: Our Image is of a generic standard hexagon head set screw and set screw lengths are measured from under the head.