... M8 material: steel zinc plated: colorful , white and blue ,black flat head notch plusnut spec: M5-M8zinc plated: colorful , white and ... blue ,blacktype: body with open notch, head with notch we use cold forged technique, not only save ... ship, electron and other fittings of industrial products. types: flat head ,countersunk head, round body, hex body, open end, closed end, body ...