... production 3.OEM customization screws 4.Used in drywall Brass copper decorative screws :1.10 years experience of screws production 2 ... , hollow rivet machine, electroplating treatment4.Optional material: SUS302,SUS304,SUS316,copper, carbon steel 5.Screw machine a minimum controllable tolerance: +/-0 ... and ISO14001 quality and environmental system certification in 2008 Brass copper decorative screws