Internal brushes and their accessories, such as handles, thread adapters, wire handles with grips, extensions for wire handles, end pieces for wire handles or handles for internal brushes are ideal for applications such as deflecting/removing/applying, derusting, descaling, deburring, grinding, surface treatment, stripping, polishing, cleaning, edge rounding, smoothing or texturing. They are particularly in demand in industries such as the automotive industry, construction, the chemical industry, mechanical engineering, energy production, crafts, DIY, wood processing, power plant construction, the plastics industry, medical technology, the metal industry, pipe and pipeline construction, petroleum industry and shipbuilding, and enable the processing of surfaces such as aluminium, stainless steel, cast iron, wood, plastic, copper, hard non-ferrous metals, steel, titanium and zinc.