Wera Tools - 7775 Open ring spanner insert, 9x12 mmOpen ring spanner insert, for hexagon screw heads or nuts; for torque wrenches of the Click Torque X series with 9x12 mm holder. Features Square insert tool 9x12 mm For torque wrenches of the Click Torque X series with 9x12 mm holder Application: Hexagon screw heads or nuts With safety pin The chrome vanadium steel version makes the plug in tools suitable for heavy loads Data Sheet (PDF)