DG is standard frame with flange of MCT Packing System where the  opening is not exactly adapted the dimension of opening inside the frame. DG has four standard sizes of DG 2, DG 4, DG 6, DG 8, It has standard dimensions of internal width 120.5mm and depth 60 mm. Multiple frames consist two or more arranged either horizontally, vertically or a combination of both. 
 
The flange width is 60mm. DG frame are made of mild steel (primed or galvanized) or stainless steel.