Wiha Security Hex bits have tips that are exact fit, precision machined to high tolerances, and are made from durable tool steel. The bits are hardened with computer controlled heat treating for maximum durability. Wiha Security Hex bits are designed for applications requiring high wear resistance. Wiha Security Hex bits have a universal fit for all standard bit holders and power tools. Wiha bits are guaranteed for their long lasting performance in the toughest and most demanding applications.