Jinggong Cast Iron Inspection Plates (also called Measuring Plates) have a particularly high density and surface accuracy that can be achieved by the use of a special alloy of cast iron. By the T-shaped reinforced ribbed pattern of the measuring plates, a very high stiffness is achieved; thereby bending and twisting can be limited to a minimum. Jinggong Inspection Plates is also manufactured according to DIN 876.The design, dimensions, and T-slot can be made on request.