The Weller RTP 004 S MS (T0050102399) RT Pico Active Soldering Tip, Chisel, 0.4mm x 0.2mm, MIL-SPEC, for WXPP MS 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.