“Product Description Screw Dimension: M2 * 8 M2 * 12 M2 * 16 M2 * 20 M3 * 8 M3 * 12 M3 * 16 M3 * 20 M4 * 8 M4 * 12 M4 * 16 M4 * 20 M5 * 8 M5 * 12 M5 * 16 M5 * 20 M2 washer M2 nut M3 Washer M3 nut M4 Washer M4 nut M5 Washer M5 nut Professional assortment and sizes to meet all your need, which will bring an easier and more convenient working environment. High Quality Carbon Steel. It exhibits good workability and high toughness up to a temperature of about 800 degrees. Rustproof Corrosion resistance Pollution free Product Quality Premium material High hardness M2 hexagonal Allen key - Diameter: 1.5mm Length: 16 * 45mm M3 hexagonal Allen key - Diameter: 2.5mm Length: 19 * 55mm M4 hexagonal Allen key - Diameter: 3.0mm Length: 23 * 57mm M5 hexagonal Allen key - Diameter: 3.5mm Length: 26 * 60mm Attention: The products contain small parts, please do not let children play to avoid accidental ingestion.