WATCH & CLOCK MAKERS GLASS FIBRE SCRATCH BRUSH
Works like a self propelling pencil - simply twist the end to make the glass fibre brush go in and out of the pen style holder.
Used on mechanical watches to remove corrosion & rust, used on quartz watches to remove corrosion from battery contacts.
May in some cases also be suitable to touch up scratches & marks on satin watch cases and bracelets.
Used by clock makers to remove small deposits of rust & corrosion.
Glass fibre can cause skin irritation so skin contact should be avoided