The set of grinding brushes includes 1 pc brass, 1 pc stainless steel, and 1 pc nylon brush. The brass brush is used for removing dirt from colored soft metals such as copper, brass, as well as for marble, stone, and for gentle surface grinding of surfaces that would be damaged by a steel brush. The stainless steel brush is used for light finishing and grinding work, on metal, wood, removing rust and paint. It does not leave unwanted iron traces on the processed material, unlike a regular steel brush. The nylon brush is used for fine structuring and cleaning wood, removing dirt and rust, for upholstery, etc.