Description: High-quality and professional workmanship make it very strong and durable. Simple and convenient installation will not waste your time and energy. The small size and light weight make it very convenient to carry and store. Different specifications allow you to choose the most suitable one according to your needs. Made of pure copper material, it is very durable to use. The outer diameter is 0.63cm and the inner diameter is 0.4cm. It is suitable for welding, electric solder iron, workshop, home, factory and so on. Item Name: Soldering Iron Tip Material: Copper Features: Wear-resistant, Sturdy, Easy to Install Size Details: Outer Diameter: 0.63cm/0.25" (Approx.) Inner Diameter: 0.4cm/0.16" (Approx.) Notes: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. If you do not use an electric soldering iron, do not let the soldering iron tip run for several hours. A black oxide layer may be formed on the top. Try tinning the tip while heating it, if you leave it for too long or run it too hot, it will burn off the solder and turn black again. Package Includes: A: 5 x Pure Copper I Soldering Iron Tips or B: 10 x Pure Copper I Soldering Iron Tips or C: 10 x Pure Copper si Soldering Iron Tips or D: 5 x Pure Copper Soldering Iron Tips (I-B-K-3C-2.4C) or E: 6 x Pure Copper Soldering Iron Tips (SK-K-3C-2.4D-B-I)