Metcal HCV-7CH0018S - HCV High Power Soldering Cartridge, Chisel, (W x L), 1.8 mm x 10.0 mm, 700 Series
The temperature/series is designated by the first digit following the dash in the part number. e.g. 700-series will be HTD-7xx, 800-series will be HTD-8xx and 900-series will be HTDC-9xx. Metcal recommends the 700-series for the majority of applications. 800/900-series for high temperature and thermally demanding applications.