... to clean and installation, durable etc.Application:sidewalk, pavement, floor, structure paltformType:W--welded steel grating L-- pressure-locked C ... gratings have strong load ability and also can prevent the access of sundries of 18mm in diameter. This kind of ... treatment. 4. If any enquiries, please contact us. outdoor floor steel grating_ditch covers,HDG steel grating,drainage cover,sidewalk grating ...