Features: The scratch brush pen can be apply in many applications, the pen style brush is good for tight place, electronic applications, removing rust and corrosion. The fiberglass brushes are soft, good to cleaning your jewelry, watch and coin. The corrosion cleaning pen is insulated, feeling safe to cleaning your battery operated devices The scratch pen set includes 3 scratch brush pen in different material, meet the cleaning and sanding needs of various scenario Twist end of the sanding brush pen to reach the desired length of bristles and stiffness as need.Advance and retract the bristles by turn end of the brush. Specifications: Component:Steel+Brass+Fiber Size:Approx.117mm/4.6inch Package Includes: 3Pcs Rust Removal Brush Pen note: 1.Please allow 1-2cm errors due to manual measurement, making sure that you not mind before order. 2.Due to the differences between different monitors, the picture may not reflect the actual of the item.