Specifications High-concerned chemical:None Origin: China Brand Name:AuroraCharm Material: The kit is made of high-quality 304 stainless steel which features strength and offers good corrosion resistance in high temperature; Cold weather; And high humidity areas Widely Used: M2 M3 M4 M5 hex socket head screws washers and nuts assortment kit serves are use for professionals; Amateurs; Landlords; Repair man; Suitable for motorcycle repair; 3D printing equipment; Communication equipment; Electronic products Package: All screws are packed in a durable and sturdy box to effectively bear the weight of the entire package; Each size is individually packed in a small bag to prevent the screws from getting mixed up during transportation Standard Metric: The screw and nut kit conforms to the standard metric; The screws kit included M2 M3 M4 M5 machine screw bolts; Nuts; Washers; It provides you with 16 sizes metric screws What you get: 880 Pcs M2 M3 M4 M5 screws nuts and washers and 4 pcs Allen key; Warm Tips: The package contains small parts; Please keep away from children to prevent accidental damage and swallowing