The Weller MT1 solder tip, with a 4mm point size and 1/8 inch tip diameter, is a high-quality conical soldering tip designed for precision and efficiency in welding and soldering tasks. Made by the reputable brand Weller, this unit is a must-have for professionals in the metalworking and manufacturing industry. The California Prop 65 Warning ensures that users are aware of any potential hazards associated with the product. With its durable construction and reliable performance, the Weller MT1 solder tip is a valuable addition to any workshop or tool collection.