1.Eye Coupling Nut 2 Grade:4.6,8.8,10.9 12.9 ... : M3-M30 4.Material:stainless steel ,carbon steel Specifications1.Eye Coupling Nut 2 Grade:4.6,8.8,10.9 12.9 ... : M3-M30 4.Material:stainless steel ,carbon steelEye coupling nuts 1.Standard:GB 2.Material: stainless steel ,carbon steel 3.Size ... ,plain5. Grade:4.6,8.8,10.9 12.9 . eye coupling nuts