Precision Jeweler's Screwdriver with concaved swivel knob to fit the finger and hexagonal shape to prevent rolling, knurled body for ease of use. This Jeweler's Screwdriver is commonly used to terminate the battery backup wires in the fiber ONT and is the perfect tool to terminate battery backup sensor wires at the battery backup unit. Solid blade made of high quality hardened tool steel. .100" blade width. 4" long.