Bolt Base A2 Stainless Steel Half Lock Nuts Jam Nuts M2 X 0.4mm Pitch - 50 Corrosion Resistant A2-70 Stainless Steel Hex Thin Nuts- DIN 439 2mm Metric Thread M2 - 0.4mm Pitch Spanner/ Wrench Size- 4.5mm Not Suitable For Replacing High Tensile Fasteners