Specification:Material: Stainless steelThread size: M3, M4, M5, M6, M8, M10, M12Weight: 425gContent:M3 55PCSM4 35PCS M5 30PCSM6 25PCSM8 15PCSM10 10PCSM12 5PCS Features: Made of stainless steel material, 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 make the mechanical parts firmly in place. Different specification screws can be used for different purpose. Used widely in the home and office appliance, furniture and other machinery industry.