The Wrench 01391 Hexagon Keys made by Wiha International is a hexagonal-shaped hand tool equipped with spherical heads. It is made of hardened, chrome-vanadium steel and each key measures 1.3mm. This wrench has an overall length of 74mm. It also features a special, ergonomic SzTool shape, allowing for a firm and comfortable grip, as well as maximum power-transmission when turning a screw, bolt, or nut. This tool is ideal for a variety of work applications, such as machine maintenance, cycle repairs, and more.