Wiha 5-Piece Insulated T-Handle Hex Screwdriver Set - Metric (33478) is a professional-grade insulated tool set designed for technicians who need both strong torque capability and certified electrical protection when working on energized equipment. This set combines the leverage advantages of a T-handle design with insulation rated for high-voltage environments, making it suitable for electrical maintenance, industrial service, and field repair work. Each screwdriver is individually tested to 10,000V AC and rated for 1,000V AC or 1,500V DC, helping provide a dependable safety barrier while allowing users to apply substantial turning force to metric hex fasteners. Key Features and Benefits: Verified electrical insulation: Each screwdriver is individually tested to 10,000V AC and rated for 1,000V AC / 1,500V DC for energized applications. Global safety compliance: Meets VDE, EN/IEC 60900, ASTM F1505, and CSA standards for professional insulated hand tools. Enhanced torque delivery: T-handle geometry improves leverage and helps apply stronger, more controlled force to hex fasteners. Anti-roll stability: Parallel flats on the handle help prevent the tools from rolling off benches or angled surfaces. Rapid tool identification: Handle caps are clearly marked with size information for faster selection and better organization. Precision-machined tips: Exact-fit hex tips help reduce cam-out and lower the risk of stripping fasteners. Premium steel construction: Built from Wiha premium-quality Chrome-Vanadium-Molybdenum tool steel for long-term durability. Specifications: SKU: 33478 UPC: 084705334783 Weight: 1.44 lb Width: 6.80 Length: 11.30 Height: 3.40 Country of Origin: Poland Voltage Rating: 1,000V AC / 1,500V DC Testing Standard: Individually tested to 10,000V AC Standards: VDE, EN/IEC 60900, ASTM F1505, CSA Blade Material: Chrome-Vanadium-Molybdenum tool steel Finish: Black oxide Included in Set: 4.0mm, 5.0mm, 6.0mm, 8.0mm, 10.0mm insulated T-handle hex screwdrivers How to Use: Select the correct size: Identify the metric hex fastener size and choose the matching T-handle driver using the size labels on the caps. Inspect the insulation: Before use, check the insulated coating for cuts, cracks, or visible damage. Do not use the tool if the insulation is compromised. Seat the tip fully: Insert the precision-machined hex tip completely into the fastener to ensure a secure fit. Apply torque: Grip the T-handle with your hand centered over the crossbar and turn clockwise to tighten or counter-clockwise to loosen. Maintain controlled pressure: Use steady force to keep the tool aligned and reduce the chance of slipping or fastener damage. Set down safely: Place the tool on its parallel flats when pausing work so it stays in place. Clean after use: Wipe the handle and blade to remove dirt, oils, or moisture. Store properly: Keep the tools in a dry environment to preserve the insulation and black oxide finish. Benefits of Using Wiha 5-Piece Insulated T-Handle Hex Screwdriver Set - Metric (33478): Improves electrical safety: Individually tested insulation helps reduce the risk of shock and arc-related injury when working near live systems. Supports demanding fastening tasks: T-handle leverage makes it easier to loosen or tighten industrial hex fasteners. Enhances jobsite efficiency: Clear handle labeling and anti-roll design help speed up tool selection and improve workspace safety. Protects fasteners: Exact-fit tips help reduce slipping and lower the chance of stripped hex sockets. Provides long-term reliability: Premium CVM steel and molded insulation are built for repeated professional use. Reduces user strain: Ergonomic T-handle configuration helps deliver torque with less effort than many standard drivers. Features: VDE-certified insulation: Provides rated protection for professional electrical applications up to 1,000V AC. Chrome-Vanadium-Molybdenum steel construction: High-performance blade material supports strength and durability. 5-piece metric coverage: Includes common sizes from 4.0mm through 10.0mm. Parallel anti-roll flats: Handle geometry helps prevent unwanted movement on flat or angled surfaces. Black oxide blade finish: Helps resist corrosion and maintain tip performance over time. Direct-molded insulation: Insulation is bonded directly to the blade for permanent protection. Handle cap size markings: Allows immediate recognition of the correct driver size. Standards-compliant design: Engineered to meet EN/IEC 60900 and ASTM F1505 insulating hand tool requirements.