Features: Made of alloy steel material, good corrosion resistance and never rust, durable to use. Equipped with a plastic box, you can classify screws in an organized manner, more convenient to carry and take out. Use this fastener with the hex wrench, hold the mechanical parts firmly in place. Different sizes for general purpose use, meet all your need. Used widely in the home and office appliance, furniture and other machinery industry. Specification: Material: Alloy steel Standard type: German standard Standard number: 10.9-7-01 Size type: M3 Box size: Approx. 13 x 6.5 x 2.5cm /5.1 x 2.5 x 0.9inch Weight: 372g Button Head: 100pcs x M3*4 80pcs x M3*6 70pcs x M3*8 60pcs x M3*10 50pcs x M3*12 Flat Head: 100pcs x M3*4 80pcs x M3*6 70pcs x M3*8 60pcs x M3*10 50pcs x M3*12 Package Included: 1 x Box of Screws Kit( Included 720pcs ) Note: Due to different producing batches, product details might be a little different. If you minding the difference, please buy it carefully. Please allow 1-3cm differs due to manual measurement. Due to the different display and different light, the picture may not reflect the actual color of the item. Thanks for your understanding. Package List 1Made of alloy steel material, good corrosion resistance and never rust, durable to use. 2Equipped with a plastic box, you can classify screws in an organized manner, more convenient to carry and take out. 3Use this fastener with the hex wrench, hold the mechanical parts firmly in place. 4Different sizes for general purpose use, meet all your need. 5Used widely in the home and office appliance, furniture and other machinery industry.