The Metcal UFT-7CN8004S Ultrafine Tweezer Soldering Cartridge, Conical, 0.4mm x 8.0mm, 700 Series Heater, is compatible with the CV-H4-UFT Ultrafine Tweezer Hand-Piece, which pairs with the CV-500 and CV-5200 Soldering Systems. It is designed with a conical geometry and 700 Series heater, which is suitable for most standard applications up to 775°F (412°C).