Proxxon is a brand of high-precision tools and machines for model-building and small-scale work. The "28941" product lable is associated with the PF 400 Professional Mini Drill / Grinder Set from Proxxon. This set features a robust, 45-watt motor and a tool holder with 19-position speeds of 5,000 to 20,000 rpm for optimal speed for each application. It includes a variety of collets and hand-wheels, plus a balanced 4 joules motor for long-term use. This powerful and ergonomically-designed mini drill/grinder set is perfect for precision drilling, milling, grinding, polishing, engraving, and other craft projects.