BGD 531/1 10-100µm (@10µm) BGD 531/2 20-200µm (@20µm) BGD531/3 50-750µm (@25µm/@50µm) BGD 531/4 250-700µm (@50µm) BGD 531/5 50-950µm (@50µm) BGD 531/6 300-2600µm (Quadrilateral @100µm) BGD 531/7 25-3,000µm (Hexagon)