The Weller RTM 004 B MS (T0050100399) RT Micro Active Soldering Tip, Bevel Cut, 0.4mm, MIL-SPEC, for WXMP MS Iron, is a versatile performance active tip for micro and standard components, suitable for the widest range of applications. 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.