The Weller RTP 025 K (T0050104799) RT Pico Active Soldering Tip, Knife, 2.5mm, for WXPP Iron, is a high performance active tip for the smallest micro components: 0402 down to 01005. The tip features a built-in sensor and perfect heat transfer, for the fastest heat-up and recovery time. The tip enables users to reduce downtime for a faster workflow and better results.