The Weller RTU 015 S MS (T0050105899) RT Ultra Active Soldering Tip, Chisel, 1.5mm x 0.4mm, MIL-SPEC, for WXUP MS Iron, is a high performance active tip for heavy duty applications and the largest components. 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.