function , they can be used in tension spring, compression spring, mechanical spring, seating spring, mattress spring , spoke, nipple, umbrella frame, construction, railway, mattress, etc. Our company possesses a strong technical force and complete inspection facilities, to provide outstanding-quality products to our users. We can produce our products according to the standard DIN, JIS, ASTM, ISO, GB/T, and YB/T. And organize production and supply in conformity with special requirements of clients.