Features Alloy steel: the hexagonal countersunk screw assortment kit is 100% brand new and made of alloy steel, which is not easy to corrode and rust, stable performance and durable Equipped with a storage box: the black alloy steel flat head hex socket screws set is equipped with a storage box with a compartment in the middle to organise the screws for easy carrying and removal 10.9 High Strength: The hexagon countersunk screw assortment kit features high strength class 10.9, exquisite workmanship, fine and clean thread structure with standard hexagon socket, round and solid surface Application: black alloy steel screw kit can be used in door and window industry, computer maintenance and assembly, automotive manufacturing and production, door and window mounting, etc. Package: the package contains 720 screws, including 100 pieces x M3 x 4, 80 pieces x M3 x 6, 70 pieces x M3 x 8, 60 pieces x M3 x 10, 50 pieces x M3 x 12; flat head: 100 pieces x M3 x 4, 80 x M3 x 6, 7. 0 pieces x M 3 x 8, 60 pieces x M3 x 10, 50 pieces x M3 x 12 Functions: The hexagonal countersunk screw assortment kit is made of alloy steel, corrosion resistant and will not rust, durable. The set of flat head Allen screws made of black alloy steel comes with a plastic box. Use this fastener with the Allen key, hold the mechanical parts firmly in place. Different sizes for general use, meet all your needs. Black Alloy Steel Flat Head Hex Socket Screw Kit is widely used in household and office appliance, furniture and other machinery industry. Specification: Condition: 100% Brand New Material: alloy steel. Standard Type: German Standard Standard number: 10.9-7-01 Size type: M3 Box size: approx. 13 x 6.5 x 2.5 cm / 5.1 x 2.5 x 0.9 inches. Weight: 372 g. Button head: 100 pieces x M3 x 4. 80 pieces x M3 x 6. 70 pieces x M3 x 8. 60 pieces x M3 x 10. 50 pieces x M3 x 12. Flat head: 100 pieces x M3 x 4. 80 pieces x M3 x 6. 70 pieces x M3 x 8. 60 pieces x M3 x 10. 50 pieces x M3 x 12. Package contents: 1 box of screws (contains 720 pieces). Note: Due to different production batches, the product details may vary slightly. If you mind the difference, please buy it carefully. Please allow for a 1 - 3 cm margin of error due to manual measurement. Due to the different display and different light, the picture may not reflect the actual colour of the item. Thank you for your understanding. Package List