Premium Material Our nut and bolt set is made of excellent carbon steel with antirust plating, excellent wear resistance, a nice smooth surface, solid and durable for longterm use, provides strength and offers good corrosion resistance in many environments. Easy to use The nuts can expand the contact area and reduce pressure to protect the screws and parts. The secant steel screw threads are uniform, smooth and tight, not easy to deform and slip during the working process, perfectly match with the nuts. Easy to carry All nuts and bolts are packed in a sturdy split plastic nest, different lengths, fully diversified assortment, organized and easy to open and look for, convenient and portable. Widely used Widely used in home and office appliances, communication equipment, ship assembly and other machinery industry, furniture, automobile and motorcycle repair and DIY inventions, industrial and construction fasteners, etc. What you get You get 30pcs m38mm, 30pcs m312mm, 30pcs m316mm, 30pcs m320mm and 120pcs m3 nuts 20pcs m48mm, 20pcs m412mm, 20pcs m416mm, 20pcs m420mm and 80pcs m4 nuts 15 pcs m58 mm, 15 pcs m512 mm, 10 pcs m516 mm, 10 pcs m520 mm and 50 pcs m5 nuts, total 500 pcs, enough for your daily use.