This scratch brushes with pen-shaped handles are used for removing rust or corrosion in hard to reach places. Made with metal ferrules for improved durability. The fine glass bristles measure 1/2" X 3/16”. The pen is rounded with three flat sides that prevent it from rolling away when you set it down. Twist the back end to extend bristles to the desired length (up to 1") to achieve the brush stiffness you need. Retract the brush when not in use to protect the bristles.
