These insulated hex key sets include the most popular sizes for work on IEC motor starters, breakers, and contactors in the growing EV market, industrial maintenance, commercial and residential electricians, and mobile technicians. Each of the insulated tools is tested to 10,000V AC and certified to 1,000V AC, in compliance with IEC 60900 standard. This metric hex wrench set includes the following sizes: 2.5, 3, 4, 5, 6, 8 mm. Ergonomic comfort grip handles provide a secure non-slip grip and easy operation; lanyard hole in the handle for safe and secure electrical work at height. Tip size is marked on the handle for easy identification. Precisely-sized, chamfered edges provide a better fit and grip reducing the likelihood of stripping fastener heads. All blades feature a corrosion-resistant black phosphate finish. This electrician tool kit is backed by a limited lifetime warranty and North American service and support by Gray Tools, a hand tool manufacturer since 1912. Tools are designed to offer users protection against accidental contact with energized materials/circuits. It is recommended that for optimum safety parts and circuits are first de-energized before any work begins. Insulated tools are an important link in the overall chain of safety when it comes to working on potentially energized material. Other important safety items include insulated gloves, insulated boots, and arc flash prevention suits and clothing. Users MUST ALWAYS complete a visual inspection of their insulated tools before use looking for signs of wear, cracking or other damage to the protective insulation around the tool(s). Tools showing any signs of wear or damage should be discarded and removed from the working environment. Certification provides users with peace of mind that their insulated tools will provide the protection promised and needed.Third party certification at VDE laboratories provides evidence each tool has successfully completed extensive and comprehensive testing in compliance with the governing standards. Uncertified or tools not bearing the double triangle or laboratory certification logo should be avoided.