The Electroplating Brushes, is used in conjunction with The Tin-Zinc Electroplating System (10049Z - sold separately). Allows you to easily plate clean parts like in-place nuts and bolts. Connect the large clamp to the part to be plated, connect the small clamp to the end of the Electroplating Brush, and dip brush into the Electroplating Solution. Slowly "paint" the surface until desired plating is achieved.