Material: Stainless steel. Product name: Hex lock nuts. Size and quantity: M3-M8, 10 pieces; M10-M12, 5 pieces; M14-M20, 2 pieces. This nut is suitable for replacing various parts such as garages, workshops, boats, home office fasteners, buildings, farms, engineering, mechanical trade, DIY. Features: 1. Material: Stainless steel 304. Compared to normal stainless steel, it is safer, more durable, non-toxic, and corrosion-resistant. It is highly hardness and not easy to deform. It can be used in outdoor wet environments. 2. Head type: Hex. 3. Product use: This nut is suitable for replacing various parts such as garages, workshops, boats, home office fasteners, buildings, farms, engineering, mechanical trade, DIY. 4. Hex nut set: In various sizes, which means you will have a selection to choose from when creating, repairing, building, or assembling. Note: 1. Please allow 0-2mm errors due to manual measurement. Thank you for your understanding. 2. The products contain small parts, keep them away from children to avoid accidental ingestion!