Adjustable open end wrench

An adjustable open end wrench comprising:

• a handle including an end having a first pivotal portion and a second pivotal portion, wherein the first pivotal portion includes a pivotal hole;
• a first jaw including a pivotal groove, wherein a pivot is disposed to the first jaw and extends through the pivotal hole and the pivotal groove, permitting the first jaw to pivot relative to the handle, and wherein the first jaw includes a first driving portion;
• and
• a second jaw pivotably connected to the second pivotal portion, wherein the second jaw is slidably connected to the first jaw, wherein an end of the second jaw opposite to the first jaw is connected to an elastic element, wherein an end of the elastic element is connected to the second jaw, wherein another end of the elastic element is connected to the handle, wherein the second jaw includes a second driving portion, wherein the first and second driving portions face each other, wherein the first and second jaws are jointly pivotable relative to the handle between a first position and a second position, wherein the first and second driving portions are close to each other when the first and second jaws are in the first position, wherein the first and second driving portions are away from each other when the first and second jaws are in the second position, and wherein the elastic element is configured to move the second jaw towards the first position
• wherein the second pivotal portion includes a first peripheral portion having a first pivotal groove, wherein a first pivotal ear protrudes from the second jaw and is received in the first pivotal groove, and wherein the second jaw is pivotable relative to the handle about a pivotal axis defined by the first pivotal ear
• wherein the second pivotal portion includes a second peripheral portion having a first limiting groove, wherein the second peripheral portion is located between the first peripheral portion and another end of the handle, wherein a first limiting block protrudes from the second jaw and is located on a side of the first pivotal ear opposite to the second driving portion, wherein the first limiting block abuts against an inner wall of the first limiting groove when the second jaw is in the first position, and wherein the first limiting block disengages from the first limiting groove when the second jaw is in the second position.