Gutebang 840Pcs.M2 M3 M4 M5 Hex Socket Head Cap Screws Bolts, Nuts, Flat The material is made of high quality 12.9 Grade alloy steel. Their surfaces are treated with black oxide, which has excellent corrosion resistance, firmness, wear resistance and low temperature resistance. Widely used in various precision machinery industries, classified instruments, meters, electronic products, household appliances, communication products, automobiles, locks, lamps, toys and so on. Specifications: Head Style: Socket Head Quantity: 840PCS Material: 12.9 Grade Alloy Steel Main Color: Black Package Included: M2 x 8mm (25PCS) M2 x 12mm (25PCS) M2 x 16mm (25PCS) M2 x 20mm (25PCS) M2 Nuts (100PCS) M2 Flat Washers (100PCS) Allen Key (1PCS) M3 x 8mm (20PCS) M3 x 12mm (20PCS) M3 x 16mm (20PCS) M3 x 20mm (20PCS) M3 Nuts (80PCS) M3 Flat Washers (80PCS) Allen Key (1PCS) M4 x 8mm (15PCS) M4 x 12mm (15PCS) M4 x 16mm (15PCS) M4 x 20mm (15PCS) M4 Nuts (60PCS) M4 Flat Washers (60PCS) Allen Key (1PCS) M5 x 8mm (10PCS) M5 x 12mm (10PCS) M5 x 16mm (10PCS) M5 x 20mm (10PCS) M5 Nuts (40PCS) M5 Flat Washers (40PCS) Allen Key (1PCS) Package Quantity: Total: 840 PCS, M2 M3 M4 M5 Hex Socket Head Cap Screws Nuts Flat Washers Assortment Set Warranty: Whenever you need us, please contact us by email or Q A. We will provide you with professional services and reply to you as soon as possible. If you are not satisfied with the product, you can get a full refund, and you can buy it with confidence. High quality: It is made of high quality 12.9 grade alloy steel, and the surface is treated with black oxide. They have excellent corrosion resistance, firmness, wear resistance and low temperature resistance. This kit can be widely used in all kinds of precision machinery, classified instruments, instruments, electronic products, household appliances, communication products, locks, lamps, lights, toys, etc. Packing Quantity: 840pcs, Packed in A Rugged Convenient Re-sealable Plastic Storage Case. Package Included: M2 M3 M4 M5 Hex Socket Head Cap Screws Nuts Flat Washers Assortment Set Whenever you need us, please contact us by email or Q A. We will provide you with professional services and reply to you as soon as possible. If you are not satisfied with the product, you can get a full refund, and you can buy it with confidence.