1. material :stainless steel ,din standard. 2. serious cleaness and high roughness 3. good surface. 4. ultrasonic clean. 1.materialaisi303,304,316,316l,1.45092.usagepipe fittings, construction parts,auto engine parts,smoking metal parts....3.strengthesFC dimension 0 defects,hign precisionin concentricity and cleaness.4.charactorsdurable,weldable,human -based,big order qty,punctual delviery time.5 ...