Rather more useful than the standard token-sized ‘screwdriver’ that comes with most new machines. Large soft brush cleans out the bobbin and feed teeth. Small screwdriver is for bobbin case tension adjustment and the larger screwdriver for general care. Use regularly to keep a machine operating at peak performance. NB Always read the manual before attempting to oil your machine. Most modern sewing machines do not require oiling. If yours was not supplied with an ampule of machine oil, the likelihood is that it doesn’t need it.