The cleaners for internal threads perfectly clean threaded holes from size M60 to M210. The patented technology enables automatic and stepless adjustment to the thread diameter in the corresponding range. For sizes M8 to M70, a set with special individual brushes is available. The grooves of the threads are cleaned from all sides, and the cleaner for internal threads removes adhering dust and dirt perfectly and the surfaces are smoothed out. This creates a uniform friction value in the thread. The stainless steel brushes are held by a brush support made of aluminum. After loosening the bolt and subsequent turning of the engagement ring, the brushes are steplessly adjusted to the desired thread diameter
(in the corresponding range).