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Stahlwille Open Ring Insert Tool, 16mm, 9 x 12mm - ST 58231016 Single Open Ended Wrench The Wera 8740 B HFStahlwille Open Ring Insert Tool, 16mm, 9 x 12mm ST 58231016 An Open Ring Insert Tool is an interchangeable tool head that combines the characteristics of a ring spanner with the flexibility of an insert tool system. It is designed to attach to a compatible handle or torque wrench, allowing for precise application of torque. The tool features a ring shaped end with a small opening, which enables it to slip around a nut or bolt and engage all sides of