The screw set is made of high quality stainless steel, high hardness, corrosion resistance, durable in use. Widely used in home and office, communication equipment, assembly of boats and other industrial machinery. Features: Material: 304 stainless steel. Sizes: M3, M4, M5. Length: 10 mm , 12 mm, 16 mm, 25 mm. Screw type: Hexagon head screw Contents: M3 x 10 mm - 35 pieces. M3 x 12mm - 35 pieces. M3 x 16mm - 35 pieces. M3 x 25mm - 35 pieces. M4 x 10mm - 20 pieces. M4 x 12mm - 20 pieces. M4 x 16 mm - 20 pieces. M4 x 25 mm - 20 pieces. M5 x 10 mm - 15 pieces. M5 x 12 mm - 15 pieces. M5 x 16 mm - 10 pieces. M5 x 25 mm - 10 pieces. M3 nuts - 140 pieces. M4 nuts - 80 pieces. M5 nuts - 50 pieces. 1 M2 hex key. 1 M2.5 hex key. 1 M3 hex key. Total: 540 pcs 304 stainless steel hex head bolts + 3 pcs hex wrenches. Attention: Products contain small parts, keep away from children to prevent swallowing.