This is a Wiha Standard Precision Tech Metric 4.0mm Nut Driver. FEATURES Made from Wiha exclusive CRM-72 (Chrome-vanadium-molybdenum) tool steel Micron Vapor Chromed for maximum corrosion protection Exact fit, narrow profile, precision machined tip Rotating cap for free turning finger control Fixed blade Molded on handle with an ergonomic shape for maximum user comfort Handle size is proportioned to the tip for precise torque to blade ratio INCLUDES Wiha Standard Precision Tech Metric 4.0mm Nut Drive SPECIFICATIONS Nut Size: 4mm Outer Diameter: 0.24" (6mm) Overall Length: 6.1" (155mm)