The Metcal UFT-7PW3150S Ultrafine Tweezer Soldering Cartridge, Power Wedge, 0.31mm x 5.0mm, 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 power edge geometry and 700 Series heater, which is suitable for most standard applications up to 775°F (412°C).