Cast iron bending plate is divided into cast iron bending plate, T-slot bending plate, granite bending plate, splicing bending plate, right-angle bending plate, right-angle bending plate, etc. It is used for inspection of components and clamping in machining. It is used to inspect the 90° angle of the workpiece, to inspect the mutual perpendicularity of the relevant surfaces of the parts when the equipment is repaired, and it is also often used for the fitter to mark the line. It can be often used for inspection, installation, vertical inspection of machine tools, and can check the verticality of workpieces on cast iron plates. It is suitable for high-precision machinery and instrument inspection and inspection of non-perpendicularity between machine tools.