Product News January 24, 2022What is a double ring spanner used for? It is suitable for loosening the nut at the beginning or locking the nut at the end. In order to avoid the damage of the nut of the oil pipe joint during disassembly, the ring wrench was modified and slotted into the oil pipe wrench. Leave a Reply Cancel replyYour email address will not be published. Required fields are marked * Save my name, email, and website in this browser for the next time I comment.