3670pcs Metric Screw Assortment,33 sizes.2000pcs Hex Socket Head M2 M3 M4 M5 Screw.1670pcs Hex Button Head M2 M3 M4 M5 Screw.Screws of every size are provided with wrenches. The screws are put into the box separately. Enough quantity to meet daily needs Machine Screw Assortment Kit is made of 12.9 Alloy Steel Hex Socket Head and 10.9 Alloy Steel Hex Button Head.High strength. The screws are plated with black zinc. No corrosion. Anti-rust and anti-corrosion. Metric Bolt Assortment, precise thread, precise cutting and no burr. Screws and nuts are closely matched. Bolts and Nuts Kit can be widely used in various precision machinery, Cars, boats,electronic products, household appliances, communication products, toys and so on. Packaging upgrade. Our screw sorting kit is packed in high-grade boxes. Our boxes are stronger, better in quality and longer in life. Can be reused. Detailed instructions are attached to the box.