Cheap And Discounts Hexagon Flange Nuts M3 M4 M5 M6 M8 M10 M12 M16 M20 304 Stainless Steel Pinking Automatic locking nut DIN6923 Serrated Spinlock Wholesale. Buy Directly From Merchant ZONST Store. Enjoy ✓Free Shipping Worldwide! ✓90 Days Buyer Protection. ✓Easy Return. ✓Money Back Guarantee.