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Hy-3 Surface Roughness Comparator Set 30 PCS 6 Groups Ra Sample Blocks for Milling Turning Grinding Surface Finish Inspection, Find Details and Price about Roughness Comparison Block Comparison Block from Hy-3 Surface Roughness Comparator Set 30 PCS 6 Groups Ra Sample Blocks for Milling Turning Grinding Surface Finish Inspection - Weifang Runlian Economic and Trade Co., Ltd.