M3 M4 M5 M6 M8 M12 BZP Lock Washers External Toothed, Serrated, Shakeproof. .
The "M3 M4 M5 M6 M8 M10 M12 External Tooth Lock Washers Serrated Shakeproof Star Zinc" would be best used in industrial settings where heavy duty and durability are a priority.
