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Hy-3 Standard Surface Roughness Reference Specimen Kit 30 Blocks 6 Machining Methods Ra Gauge for CNC Machining Surface Texture Testing, Find Details and Price about Roughness Comparison Block Comparison Block from Hy-3 Standard Surface Roughness Reference Specimen Kit 30 Blocks 6 Machining Methods Ra Gauge for CNC Machining Surface Texture Testing - Weifang Runlian Economic and Trade Co., Ltd.