The mechanical character can be classified into two items: level 8.8 and 5.8.Both of them are friendly-environmental.

 The mechanical character can be classified into two items: level 8.8 and 5.8.Both of  them are f-environmental-friendly .

Also, the material can be 35k, so it's sustainable for the environment and doen't cause the pollution of the air and so on.

1.material: steel,zinc plate2.can be applied to concrete or nature rock.3, pre-assembled for qucik installation

carbon steel screw