The Metcal UFT-6CN5504R Ultrafine Tweezer Soldering Cartridge, Bent Conical, 0.4mm x 5.6mm, 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 bent conical geometry and 600 Series heater, which is suitable for temperature sensitive applications up to 675°F (357°C).