Drive-Loc VI Interchangeable Blade Extension. 6.5"/150mm OAL. High alloy Chrome-vanadium-molybdenum steel, through hardened, hard chrome finish. Drive-Loc VI Features Adjustable/Reversible Locking Blades Selectable Lengths from 1.7" to 4.8" in 1/8" IncrementsBlades Made of High Performance CRM-72 Tool SteelThrough hardened & Hard Chromed for maximum durabilityGuaranteed Professional Field Service Quality Made By WihaWiha uses the same image for many products. Photo may not be exactly as product appears. Please read description carefully.