Features: - Our hex nut and bolt assortment sets are made of high-quality carbon steel, which is sturdy, and durable for long time use. - The bolts threads are smooth, sharp and accurate, not easy to deform and slide in the working process. - The socket bolt and nut set comes with a plastic organizer box for storage, also suitable for collecting your small accessories. - You will get 500 pcs m3, m4, m5 bolts and nuts, which is enough for your daily use. - Suitable for furniture and ship repair, machine made, vehicle construction site and building, ect.