... : clear and smooth figure, silvery appearance, modern-styled.2.Optimal drainage: Leaking area can reach 83.3%, which is as twice ... of shapes, sizes, spans, load capability in different conditions.1. Drainage cover with embedded parts:2. U-type: As to ditches ... weight.single-side full welding every 3 bearing bars. round metal grating,rain draining system,drainage cover,pool cover grating