... specification:M3 ,M4 ,M5, M6, M8 ,M10 ,M12, inch: 1/2,3/8,1/4,5/32 3/16,5/16. material: steel ... , car, ship, electron and other fittings of industrial products. types: flat head ,countersunk head, round body, hex body, open end, closed end, body ... , inch: 1/2,3/8,1/4,5/32 3/16,5/16. material: steel, stainless steel, brass,aluminium. M4-M10 flat head hex Rivet ...