Bolt Base 3mm A2 Stainless Steel Internal Toothed Shakeproof Washers Tooth Lock Shake Proof Washer DIN 6797J M3 - 100 Corrosion Resistant A2-70 Stainless Steel Toothed Shakeproof Washers- DIN 6797 Approx Dimensions- Inner 3.2mm, Outer 6mm, Thickness 0.4mm Ideal For A Wide Range Of Applications