Same as 50/E, except without speed control. Load speed is 20,000RPM. If you run this machine while using our transformer NG 5/E as a power supply, the speeds are adjustable between 5,000 and 20,000RPM. This lightweight high precision tool in a pen style design (Ø only 1 3/8") is ergonomically formed to allow comfortable handling and optimal control. It's quietness and effortless, vibration- free drive via the special permanent magnet motor, the ground spindle and collar bearing all contribute to the ergonomic design. An efficient cooling system facilitates extended use under various load conditions. This tool is useable on any workable material e.g. steel, precious metals, wood, glass, ceramics, plastics, precious stones. Ideal for model builders, woodcarvers, jewelers, opticians, artists, dental technicians, tool and die makers, etc.