340 Pcs M3 Small Metric Screw Assortment Suitable for 3D Printer DIY 12.9 Grade Alloy Steel Hex Socket Head Cap Bolts Nuts Kit Black Zinc Plated

Features: Suitable for Small DIY Projects: Small black screws and nuts suitable for small DIY projects such as 3D printing and RC cars DIY. Black and Not Oily: This product adopts a Black Zinc Pated process which is different from the traditional Black Oxide process.Has a better rust prevention function not easy to be contaminated with dust and the most important thing is not to make your hands or the small items oily. High Quality Alloy Steel:12.9 grade alloy steel with superior rust resistance ensures long lasting results， corrosion resistance anti-aging good toughness. Well packed: We use a small plastic box with clear classification to place these small screws. To prevent screw confusion we also prepare another outer packaging to ensure that the products are not damaged during transportation. Specifications: Surface finish：Black Zinc Plated Pitch:The distance between adjacent threads of these