Offers you full protection: Each tool is individually tested at 10,000 V AC and approved for 1,000 V AC. Improves accessibility: Deep-lying screws can be reached effortlessly. When working on live parts, the safety of the user is paramount. The insulated extension, in combination with the insulated ratchet wrench or T-handle adapter, enables good access to deep-lying screws and nuts. The insulated extension is subjected to routine testing in accordance with the international standard IEC 60900 and enables safe work in the area of live parts up to 1,000 V AC.