The disc polishing unit is suitable for surfaces that are sensitive to touch like acrylic and water-paints, glass-plastics and stone. The device is small, light but is rugged owing to the integrated machined gears. There is step restriction of gearing done in two stages for low/high speed torques up to 7Nm. It also provides a secure restart cut-out option and pre-calibrated speeds, with consistent speed maintained even under load. It is is secure against high temperatures, with double-insulation and auto-stop brushes provided with a magnesium-alloy gearbox.