... Grade:4.8 ,6.8,8.8,9.8..... CIRCLIP,EXTERNAL CIRCLIP ,INTERNAL CIRCLIP. A good non-standard fastenerS manufacturer for your better ... choice .1.What’s the specification of our Products ? MaterialsCarbon steel,Stainless ... CH38F,1039,40ACR...Alloy steel are 35,40CrMo,SCM435,10B38...Stainless steel is SS201,202,302,304,316...copper is shiny ...