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INDUSTRIAL-GRADE PARALLEL SPACERS: Metric precision 23-hole parallel spacers, suitable for various machine tools, can be leveled in precision machining, used for setting, layout and inspection operations, so that the workpiece can meet the high precision requirements. MATERIAL AND HARDNESS: 40r high quality steel material, product quenching and fine grinding. The hardness of the product is 52-58 degrees. TOLERANCE: Dimension tolerance: ¡À0.005mm, perpendicularity: 0.0075mm, parallelism tolerance: 0.005mm THREADED HOLES AND CUSTOMIZATION: 5 3/8-16 threaded holes are used for clamping and 18 untapped holes are available for you to customize the conditions and conditions of use, which is convenient to meet your various needs. BEST QUALITY FOR BEST YOU