... common welding standard: single-side full welding every 6 bearing bars.Bearing bar centers at 30mm: This ... standards are available. The products most commonly used for Belt corridor, storage shelf,Attic panel, trestle, ... single-side full welding every 3 bearing bars.Notes for ordering:1. Please clearly state specifications, types, ... If any enquiries, please contact us. steel grill for door&window grates