Discover the Premium Insulated 4mm T Handle Hex Key, expertly engineered for safe and efficient use on connector boxes. Made with high-quality injection moulded nylon 11, this hex key surpasses IEC 60900 standards, ensuring you have a reliable tool for live line working. Designed to endure extreme temperatures from -40°C to 70°C, it is the only tool in its category that meets stringent Category 'C' requirements. Renowned for its outstanding toughness, this nearly indestructible tool is backed by a lifetime warranty on both the tool and its insulation, making it the go-to choice for professionals. Upgrade your toolkit today with this essential insulated hex key and enjoy unmatched safety and durability for all your electrical tasks.