Wera Tools - 7783 C Square drive insert, 14x18 mmSquare drive insert, for 1 2"" square socket wrench inserts and 1 2"" connecting parts with square drive; for torque wrenches of the Click Torque X series with 14x18 mm holder. Features Square insert tool 14x18 mm For torque wrenches of the Click Torque X series with 14x18 mm holder With safety pin For 1 2"" square socket wrench inserts and 1 2"" connecting parts with square drive The chrome vanadium steel version makes the plug in tools suitable for