... . 3. Delivery:7-30days 4.Availability:20,000tons/year "Wanjie" stainless steel grating has the characters of Light weight, heavy-duty, large ... centers at 30mm: This kind of steel grating is the most commonly used in projects with American, Australian, Japan standards are available ... . 3. In the case of stair treads, please specify its type, length, width, quantity and surface treatment. 4. If any ...