... inch4) Surfaceblack, yellow zinc, white zinc, white blue zinc, and Dakeluo5) Grade of strength4, 6, 8,10,126) MaterialsSWRCH8A, ... include: low carbon, high tensile and alloy; 4, Working process include: cold forged, hot forged, and machining, also CNC machine, 5, ... Full sizes available to include metric, and ...