... , open end, closed end, body with ribben, body with groove. Fastener we use cold forged technique, not only save materials,good ... used in furniture, car, ship, electron and other fittings of industrial products. types: flat head ,countersunk head, round body, hex body ... 3/16,5/16. material: steel, stainless steel, brass,aluminium. Fastener -rivet nut