This circular drill press light has 14 LED lights that surround your drill bit for bright, even illumination with no shadows. Thumbscrews allow for quick, tool-free installation on quill diameters from 1-5/8 inches (42 mm) to 3-15/16 inches (100 mm). The switch has a powerful magnet on the rear to enable mounting on any steel or cast iron surface. A 4.5-volt DC transformer supplies the power.