The Weller RT4MS 0054461899 RTMS Series is a Chisel Solder Tip, 1.5 x 0.4mm, for WMRPMS Only. The RT4MS features a heater that is contained in the tip for super-fast heat-up and temperature recovery, a high-grade heat transfer system that ensures perfect temperature stability, and a soft molded grip that is comfortable and facilitates tip change. The heat transfer system will handle ground planes and multi-layer boards. No tool or tip pad is required to change the tip since the tip inserts securely into the WMRS Solder Iron via a stereo jack. Additionally, the RT4MS it exceeds Mil-Spec.