256.4 is a range of electronic and electro-mechanical components from the Facom brand. It includes items such as screwdrivers, socket sets, wrenches and ratchets, pliers and cutters, nut drivers, hex keys, riveters and drive bits, screwdriver tips and adaptors, specialty tools, crimpers and strippers, test and measurement tools and more. These items are essential for any toolbox and are often used for tasks such as tightening screws, cutting wire and cable, removing stuck bolts, and working on circuit boards.