The Detoolz cleaning brush is designed for cleaning copper pipes with diameters of 12mm, 15mm, and 18mm. Its plastic handle and round head shape allow for easy and effective cleaning of internal openings and pipe connections, removing deposits and dirt to prepare for welding. The brush is inserted into the pipe to be cleaned and moved back and forth. Using a brush with a diameter slightly larger than that of the pipe being cleaned enables the bristle tips to scrub the interior of the pipe.