... of bolts and nuts screws material is steel, custom request is acceptable professional manufacturer over 10years Product NameNickel hardware connection bolts and ... Zinc, Black Oxide, QPQ,electroplating, spraying, and painting and so on.PackingWooden box, or as per the ... , drilling, turning, grinding, tapping, mould design and processing, casting, sheet mental working etcApplicationAutomation machine, ...