Designed with three LEDs to brightly illuminate your work, the 1-5/8" dia. by 5/8" thick disc has a series of small, flexible grippers to fit on any driver with a shaft diameter between 3/16" and 7/16". It even has embedded rare-earth magnets so you can attach it to any ferrous surface for general work illumination. Button-cell batteries included.
A great toolbox addition.