The Wiha System 4 features interchangeable blades, handles, bits, allowing you to build a custom field service kit for your requirements. The narrow handle gives you more maneuverability in tight locations and is adjustable, allowing you to work in whatever space you need. The collar lock design keeps the bit tight so no more wobbly or falling bits. The bits are precision machined for an exact fit, and the Wiha Tools quality steel provides unmatched durability.