Insulated-Socket-Set-of-19-1-2in-Drive-ITL-Insulated-UKC-03095-p-International-19-piece-set-of-insulated-sockets-&-accessories-p-p-The-sockets-reversible-ratchet-&-extension-bars-are-totally-insulated-for-maximum-personal-protection-Made-from-injection-moulded-nylon-11-which-exceeds-the-requirements-of-IEC-60900-the-industry-standard-for-live-line-working-p-p-In-addition-these-tools-meet-the-requirements-of-Category-C-which-requires-them-to-perform-at-extreme-temperat