The Wiha International electronic part 01126 is a hexagon key or "wrench" with a HEX size of 4mm and a total overall length of 72mm. It is made from high-grade material, and its compact design makes it easy to use in tight spaces. The key features a precise fit and offers an enhanced grip which provides reliable and comfortable operation. This high-quality tool is ideal for working on small electronic components and in restricted areas.