JBC Tools R470029, Cartridge Chisel 2.7 X 1JBC Tools R470029, Cartridge Chisel 2. 7 X 1 This cartridge is designed for the use in Automated Processes with high power requirements. The new design features a square cross section that perfectly centers the cartridge in the soldering iron and ensures accurate vertical positioning. In addition, the cartridge can be placed used in 4 different positions, which can be changed in steps of 90. R470029 fits TR470 Heavy Duty Soldering Tool and TRA470