Material:Stainless Steel, carbon steel, Carbon Steel
Standard:ISO,DIN, ANSI/ASME, JIS ,GB
Surface treatment:zinc plated ,dacronet,hot zinc plated, heated treatment
Grade:4.6,4.8,5.8,6.8,8.8,,10.9,12.9
Size:ST2.9,ST3.5,ST4.2,ST4.8,ST5.5,ST6.3