i'm hunan province xiangxiang city changhong foundry co.,ltd we are a specialized manufacturer of ductile-iron manhole cover, access cover, castings. The standard according to ISO, JIS, DIN, ASTM, EN, BS etc. and we are producing product to Germany,Canada,and USA.now! Our products have the following special advantages: 1. Strictly manufactured according to ISO 9001: 2000 and EN124 2. High load capacity (Max. 600 kn) 3. Long service life (Min. 80 years) 4. Well sealed, no noise pollution and rebound 5. Good wear and corrosion resistance 6. Special Relief Sculpture on Surface 7. Perfect design We also can process according to the customer's drawing. there is four grades of load capacity are available: 1. A15 2. B125 3. C250 4. D400 if you have this need, Please contact me with full specification i will pay a considerable attention to you, and give you a most favourable price. the more information about our company you can see our website, wangbin best regards!!