20Pcs 302 Carbon Steel Self tapping Thread Insert Accessories(Inner M2*0.4 Outer M4.5*0.5) Features: 1. Made of carobn steel, durable e. 2. Large contact area, it can bear strong tension.   3. Strong resistance to vibration which can prevent loosening. 4. Easy and convenient to install, quickly and simply.  5. Widely used in the automotive industry, rail vehicle industry, shipbuilding industry, household appliances, construction machinery, business machinery, electronic products, engineering plastics, advanced furniture, aluminum die-casting and other industries. 6. Available in nine styles for your choice.   Specification: Condition: Material: Carbon Steel Weight: Approx. 9-229g / 0.3-8.1oz Length: Approx. Inner M2x0.4 Outer M4.5x0.5: 6mm / 0.2in Inner M4x0.7 Outer M6.5x0.75: 8mm / 0.3in Inner M3x0.5 Outer M5x0.5: 6mm / 0.2in Inner M5x0.8 Outer M8x1.0: 10mm / 0.4in Inner M6x1.0 Outer M9x1.0: 12mm / 0.5in Inner M6x1.0 Outer M10x1.5: 14mm / 0.6in Inner M8x1.25 Outer M12x1.5: 15mm / 0.6in Inner M10x1.5 Outer M14x1.5: 18mm / 0.7in Inner M12x1.75 Outer M16x1.5: 22mm / 0.9in   Package List: 20Pcs Thread Inserts