Material: carbon steel. Color: black. Type: Screw & agrave; round head & agrave; M3 hexagon socket, with M3 hexagon nut, flat washer and spring washer. Quantity: 300 pieces in total, delivered with storage box. D & eacute; details: Screw & agrave; M3x4mm hexagon socket, 25 pcs. Black carbon steel screws M3x5mm, 25 pcs. Screws & agrave; M3x6mm hexagon socket, 25 pcs. Countersunk hexagon screw M3x8mm, 25 pcs. Black carbon steel screw M3x10mm, 25 pcs. Screws Alloy steel socket head M3x12mm, 25 pieces. & Eacute; M3mm black carbon steel hex nut, 50 pieces. M3mm black carbon steel flat washer, 50 pieces. Washer M3mm black carbon steel spring, 50 pcs. Use: Fasteners for machinery industry, household appliances, bicycle, automobile, etc. & Agrave; About the product: Manufactured; made of high quality carbon steel, safe and durable. use. 1 set of M3 screws in 6 assorted sizes, meets your different needs. Notes: Please keep in a dry place. Please check the size before purchasing. Changrongsheng