Bolt Base A2 Stainless Steel Hex Serrated Flange Nuts Flanged Nuts M6 X 1.0mm Pitch - 50 Corrosion Resistant A2-70 Stainless Steel Serrated Flanged Nuts- DIN 6923 6mm Metric Thread, M6 - 1.0mm Pitch Spanner/ Wrench Size- 10mm Not Suitable For Replacing High Tensile Fasteners