1.v iron-use: is used to support shaft, tube, sleeve etc. cylindrical workpiece, the workpiece axis line parallel to the face at our station, and crossed to find is a tool. 
 2.V iron-standard: according to national GB4972-85 standards for manufacturing, supply is generally in pairs, is a rectangular body, the work surface or four different sizes of four 90-degree slot. Main shaft parts for inspection and marking. 
 3.V iron-specifications: 100 × 100 × 80mm, 150 × 150 × 80mm, 200 × 200 × 90mm, 300 × 300 × 120mm