... of steel gratings, it is made of the M8 bolt, top clip and bottom clip. The method of ... welded fixing: At the first flat bar of every corner, the ... 20mm long and 3mm high. The method of clip fixing: There are at least ... 5mmMaterialQ235,SS304,SS316Surface treatmentBlack , hot dip galvanizing ,paintFields of ApplicationPlatforms , sidewalks , filter grates ,ventilation grates , ...