4.Standards: JIS, ANSI, ASTM, DIN, BS, GB
3.Size: all sizes
2.finish:such as bright, zinc plated, yellow zinc plated
1.Material :carbon steel, Copper,Aluminum,Iron,or stainless steel and so on
Plain washer(flat washer ,washer)
plain washer(flat washer,washer)
1.20 years manufacturer experience
2.profeestional production line
3.ISO9000-2000 approvel