Bolt Base 4mm A2 Stainless Steel Nylon Insert Nyloc Nylock Lock Nuts M4 X 0.7mm Pitch - 10 Corrosion Resistant A2-70 Stainless Steel Nyloc Lock Nuts- DIN 985 4mm Metric Thread, M4 - 0.7mm Pitch Spanner/ Wrench Size- 7mm Not Suitable For Replacing High Tensile Fasteners