It is not easy to be deformed, and it is made of high-speed steel, which has higher hardness, wear resistance and heat resistance than bearing steel In order to effectively reduce bumps and scratches, the edges are rounded (≤10mm) and the edges are blunt (>10mm) The sealed shock-proof wooden box has a certain precision reserve in the measurement surface parallelism and surface roughness of the length variation of the gauge block. High precision, good stability, good heat resistance, high temperature resistance, made of bearing steel heat treatment As a length standard, it transmits the size value, is used to verify the indication error of the measuring articulation, is used for the adjustment of precision machine tools and precision marking in machining, and is used to calibrate and adjust the zero position of the measuring instrument, Manufacturer: GQNBLVHZUPDM