Feature: *It is suitable for many 510-port battery hosts on the market. *The resistance is 0.7 ohms. *When you use the host over 30w, please set the maximum to 30w. Because the greater the power, the life of the soldering iron heating core will be lost. *510 interface thread diameter is M7*0.5mm. Specifications: Product Name: Soldering Iron Tips Set Material: Copper Color: Gold + Silver Size: As shown Power: 30w Cutter head: Horseshoe Shape Suitable for: precision welding Quantity: 8pcs set Package Included: 1 × Soldering Iron Rod 2 × Heating Core 5 × Soldering Iron Tips Note: 1.Transition: 1cm=10mm=0.39inch. 2. The real color of the item may be slightly different from the pictures shown on website caused by many factors such as brightness of your monitor and light brightness. 3. Please allow slight manual measurement deviation for the data.