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