The Metcal UFT-6PW2954C Ultrafine Tweezer Soldering Cartridge, Power Wedge, 0.29mm x 5.4mm, 600 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 wedge geometry and 600 Series heater, which is suitable for temperature sensitive applications up to 675°F (357°C).