1. material :stainless steel 304 ,din standard. 2. serious cleaness and high roughness 3. good surface. 4. ultrasonic clean. 1.the materialaisi304,303,1.4305,1.44352.processcnc machining,lathing,turning3.torlerancehign precision in center hole , and thread4.strengthdurable,weldable,small order qty/production lot,competitiv price5.usageauto parts, tool parts, smoking accessary, machinery parts, ...