Metric Fine Class 8.8 High Tensile (Standard Head Size) 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. The included washers are supplied at no extra cost. Supacheap Bolts Hexagon Head Class 8.8 High Tensile Set Screws are manufactured to DIN Standard 961 and our bright zinc plated finish offers corrosion protection and suitable for general purpose high strength internal and external bolting where maximum adjustment may be needed, and for fastening blind threaded components where a thread, running the full length of the bolt, is required. Typical applications for this very widely used product include steel fabricators, machine builders, automotive applications and the mining and construction industries. 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 the length of a set screw is measured from under the head.