It is suitable for many 510-port battery hosts on the market. The resistance is 0.7 ohms. When you use the host over 50w, please set the maximum to 50w. Because the greater the power, the life of the soldering iron heating core will be lost. 510 interface thread diameter is M7 x 0.5mm Model Number:Soldering iron tip Power:15w Scope of application:precision welding Specification:cutter head horseshoe shape color:Gold Material:Metal Package Contents: 1 x rod 3 x soldering iron tips 2 x replacement cores Only the above package content, other products are not included. Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.