Internal brushes and their accessories, such as clamping shafts, threaded adapters, wire handles with eyelets, wire handle extensions, wire handle end pieces, or handles for internal brushes, are ideal for applications such as removal/abrasion/application, derusting, descaling, deburring, grinding, surface treatment, paint stripping, polishing, cleaning, edge rounding, smoothing, or texturing. Particularly in demand in industries such as automotive, construction, chemical, electrical engineering, energy production, crafts, DIY, woodworking, power plant construction, plastics, medical technology, metalworking, pipe and pipeline construction/oil industry, or shipbuilding, they enable the processing of surfaces such as aluminum, stainless steel, cast iron, wood, plastic, copper, hard non-ferrous metals, steel, titanium, or zinc.