• Complete 550-piece kit including 130 screws, 140 nuts, 140 lock washers, and 140 flat washers. • Includes 7 lengths of M3 screws: 6 mm, 8 mm, 12 mm, 16 mm, 20 mm, 25 mm, and 30 mm. • Made of high-quality 304 stainless steel, corrosion and rust resistant. • Button head screws with internal hex drive. • Supplied in an organized and labeled plastic box for easy storage and use. • Includes a hex key for easy installation. • Ideal for precision mechanics, furniture repair, electronics, and 3D printers.