UFO L.E.D. 3 in 1 Tool Light Slides on screwdrivers, 1/4" socket extensions, bit extensions and tools with shafts from 3/16" to 7/16" diameter. Provides light right on the spot where you need it. Magnetic back for use as a portable light on any metal surface. Can be used as a hand held flashlight. 3 power L.E.D.s provide wide beam and bright illumination. L.E.D. bulbs last 100,000 hours. Powered by 3 micro alkaline cells, type LR44 (included). Housing is made of non-slip rubber and is weatherproof.