High Quality Materials: Made from high-quality alloy steel to provide strength. These bolts and nuts are durable and designed for long service life.M3 Sizes: Includes M3 x 4 - 25 pcs, M3 x 5 - 25 pcs, M3 x 6 - 25 pcs, M3 x 8 - 25 pcs, M3 x 10 - 25 pcs, M3 x 12 - 25 pcs, M3 hex nuts - 50 pcs, flat washers M3 - 50 pcs, and spring washers M3 - 50 pcs.Quantity: 150 pieces of bolts with assorted nuts, washers, and spring washers to meet various needs. Ideal for replacing broken or lost screws.Easy to Use: All screws and nuts are organized in a transparent plastic storage box for easy classification. Helps simplify tasks and improve efficiency.Wide Application: Six common sizes and three types included, suitable for general use in precision machinery, measuring instruments, electronic devices, household appliances, communication equipment, locks, lighting fixtures, toys, and more.Product Features:- Constructed from high-quality alloy steel for strength and durability.- Set includes 150 bolts with matching nuts, washers, and spring washers for diverse applications.- All components are neatly packed in a clear plastic box for easy organization and access.- Socket head screw assortment kit is ideal for use in home, workshop, woodworking, construction, plumbing, 3D printing projects, and assembly tasks.Specifications:Material: Alloy Steel Color: Black Size: Hex Bolt Diameter: 3mm (Lengths: 4mm, 5mm, 6mm, 8mm, 10mm, 12mm) Hex Nuts Diameter: 3mm Flat Washer Diameter: 3mm Spring Washer Diameter: 3mm Package Includes: 25 Pieces M3x4 Hex Bolts 25 Pieces M3x5 Hex Bolts 25 Pieces M3x6 Hex Bolts 25 Pieces M3x8 Hex Bolts 25 Pieces M3x10 Hex Bolts 25 Pieces M3x12 Hex Bolts 50 Pieces M3 Hex Nuts 50 Pieces M3 Flat Washers 50 Pieces M3 Spring Washers