The Metcal STTC-197 STTC 700 Series Soldering Cartridge, 0.14 x 0.21 in. (3.6 x 0.21 mm), Grooved Semi-Rigid Coax, is highly durable and ideal for through-hole and SMD Rework. It is designed for use with the MX-500, MX-5000, and MX-5200 Systems, and with the MX-RM3E, MX-RM6E, MX-H1-AV, and MX-H7-SF Solder Hand Pieces. The cartridge is equipped with the 700 Series heater, which is ideal for most standard applications.