Bolt Base 12mm A2 Stainless Steel Fine Pitch Hexagon Half Lock Nuts Hex Thin Nut DIN 439 M12 X 1.25mm - 10 Corrosion Resistant A2-70 Stainless Steel Hex Thin Nuts- DIN 439 12mm Metric Thread, M12 - 1.25mm Pitch Spanner/ Wrench Size- 19mm Not Suitable For Replacing High Tensile Fasteners