... :7-30days 4.Availability:20,000tons/year 5.Material:steel Socket-welding steel grating:This kind of products have the same features ... the unique characters of Uniform precision,exquisite,natural harmony, elegant style. Application: widely applied to underground, urban construction, port, theatre, and ... and surface treatment. 4. If any enquiries, please contact us. steel grill for door&window grates