Superb Material: All hex socket head bolts and nuts kit are made of carbon steel material, -, rust-proof, not easy to break, still maintain high strength and excellent performance in harsh environments, and . Hex Socket Head Cap Screws Bolts: Assorted bolts nuts and washers kit threads are clear and firm, smooth and burr-free, easy to insert and not easy to loosen. The of nut and washer expands the contact , reduces stress, and protects screws and parts. Widely Used: Suitable for precision machinery, classification inst ents, electronic products, meters, household appliances, communication products, furniture, locks, lamps, toys, bicycles, furniture, license plates, automobiles and other fields. name:Hex Socket Head Cap Screws Kit Drive Style:Hex Socket Model Number:Hex Socket Head Cap Screws Kit Screw Type:Machine Screws Colour:Black Material:304 stainless steel Package Contents: 1 set * Hex Socket Head Cap Screws Kit Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.