Description: Made of high quality stainless steel, and durable for a long time use Easy to install and durable to use These screws and nuts will be great replacement for industrial and construction fasteners. Used widely in the home, office, school, , garden, bicycle, motorcycle, automobile, workshop, electric equipment, ship assembly and other machinery industry. All of screws will be packed in a sturdy plastic box, can be use for a storage box. Specification: Material: 304 stainless steel Size: 13*6.8*2.5cm/5.12*2.68*0.98inch It contains the following sizes: Button Head M3 x 4 100pcs M3 x 6 80pcs M3 x 8 70pcs M3 x 10 60pcs M3 x 12 50pcs Flat Head M3 x 4 100pcs M3 x 6 80pcs M3 x 8 70pcs M3 x 10 60pcs M3 x 12 50pcs Package Includes: 1 Piece set screws Assortment Kit (720pcs) Note: 1.We provide clear pictures, measurements where possible. Please check as much as possible to make sure the item is the one that you need. 2. Please allow 0.5-1 inch difference due to manual measurement.(1 inch=2.54cm) 3. Instruction is not included.Due to the difference between different monitors, the picture may not reflect the actual color of the item. Please understand,Thank you.