Bolt Base A2 Stainless Steel Hex Full Nuts M3 X 0.5mm Pitch - 50 Corrosion Resistant A2-70 Stainless Steel Hex Full Nuts- DIN 934 3mm Metric Thread, M3 - 0.5mm Pitch Spanner/ Wrench Size- 5.5mm Not Suitable For Replacing High Tensile Fasteners