... factory 3,Rich experience 4,plentiful example 5, Professional Service stainless steel floor grid /display rack grid wall /off grid 5kw home solar ... ,tair tread ,fence ,pavement gratingType:W--welded steel grating L-- pressure-locked C-- socket-weldingBearing bar centers:15-30, 40, 60 ... . 3. In the case of stair treads, please specify its type, length, width, quantity and surface treatment. 4. If any ...