The following screwdrivers are used to tune Johanson gigatrimmers, coils, trimmers etc… or other components that need manual tuning. Some have a metallic tip, others have non magnetic brass or ceramic porcelain tip, it is also specified what model they are suitable for. The 2 models CT-01 and CT-02 have to be shaped, CT-02 is very hard so to be shaped it is necessary a millstone or a diamond-cut file.
