... :7-30days 4.Availability:20,000tons/year TypeW-- welded steel grating L-- pressure-locked C-- socket-weldingBearing ... : This kind of steel grating is the most commonly used in projects with American, Australian, Japan standards ... structural drawing, sectional view and joint drawing. 3. In the case of stair treads, please specify its type, ... mild steel grating,banded steel grating,welded metal grating