Specifications: The Carbon Steel Grub Screw features resistance to extension and corrosion in various environments. Its hexagonal head design allows for easy handling with a hex key. Ideal for confined areas and high-strength applications. Material: High-strength Carbon Steel Grade 12.9. Screw size and quantity: M4 * 4/5/6/8/10/10/12/16/20 mm, 100 pieces. M5 * 3/4/5/6/8/10/12/16/20 mm, 100 pieces. M6 * 4/5/6/8/10/12/16/20 mm, 50 pieces. M8 * 6/8/10/12/16/20/20/25/30 mm, 20 pieces. Note: Please allow for 1-3 mm errors due to manual measurement. Keep away from children and infants and avoid swallowing.