Wiha Security Hex bits have tips that are exactly fit, precision machined to high tolerances, and are made from durable tool steel. The bits are hardened with computer-controlled heat treatment 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.