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: Condition: 100% Brand New Material: Alloy Steel Standard type: German standard Standard number: 10.9-7991-03 Screw type: M3/M4/M5 Color: Black Box size: Approx. 17.5 x 10 x 2.3cm / 6.8 x 3.9 x 0.9inch Weight: 510g Package Included: 20PCS x M3 x 8 20PCS x M3 x 12 20PCS x M3 x 16 20PCS x M3 x 20 80PCS x M3 Nuts 20PCS x M4 x 8 20PCS x M4 x 12 20PCS x M4 x 16 20PCS x M4 x 20 80PCS x M4 Nuts 15PCS x M5 x 8 15PCS x M5 x 12 15PCS x M5 x 16 15PCS x M5 x 20 60PCS x M5 Nuts Note: Please allow slight deviation for the color and measurement. 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.