A wrench for rotating a hexagonal object comprising: a first wrench member comprising a handle having a first end and a second end with a fixed jaw attached at said first end and a cavity formed in said fixed jaw and said first end; a second wrench member comprising a movable jaw with a curved jaw attached to a ratcheting element wherein said ratcheting element is slideably disposed in said cavity to position said curved jaw opposed to said fixed jaw; said second wrench member constrained by said ratcheting element disposed in said cavity that has a plurality of bearing surfaces, and a cavity insert member for said ratcheting element to slide in said cavity about the center of an arc (54, 56, 61) defined by the shape of said bearing surfaces and said cavity insert member, and said second wrench member is biased by an elastic compression element to move toward said fixed jaw; and a first gripping surface of said curved jaw is structured relative to the center of said arc (54, 56, 61) to cause said curved jaw to be urged toward said fixed jaw when said handle is moved in a direction to urge said fixed jaw toward said curved jaw when a polygonal object is between said fixed jaw and said curved jaw, characterised by cavity insert member being positioned between a rearward wall of said cavity and a bearing surface of said ratcheting element, and in that said cavity insert is a wedge fastened in a slot formed by bottom rearward aspects of the said sidewalls, and the bottom aspect of the rearward wall, said cavity insert acting as a retaining member for the ratcheting element, a bearing surface for the ratcheting element, and a spring seat for the elastic element. a first wrench member comprising a handle having a first end and a second end with a fixed jaw attached at said first end and a cavity formed in said fixed jaw and said first end; a second wrench member comprising a movable jaw with a curved jaw attached to a ratcheting element wherein said ratcheting element is slideably disposed in said cavity to position said curved jaw opposed to said fixed jaw; said second wrench member constrained by said ratcheting element disposed in said cavity that has a plurality of bearing surfaces, and a cavity insert member for said ratcheting element to slide in said cavity about the center of an arc (54, 56, 61) defined by the shape of said bearing surfaces and said cavity insert member, and said second wrench member is biased by an elastic compression element to move toward said fixed jaw; and a first gripping surface of said curved jaw is structured relative to the center of said arc (54, 56, 61) to cause said curved jaw to be urged toward said fixed jaw when said handle is moved in a direction to urge said fixed jaw toward said curved jaw when a polygonal object is between said fixed jaw and said curved jaw, characterised by cavity insert member being positioned between a rearward wall of said cavity and a bearing surface of said ratcheting element, and in that said cavity insert is a wedge fastened in a slot formed by bottom rearward aspects of the said sidewalls, and the bottom aspect of the rearward wall, said cavity insert acting as a retaining member for the ratcheting element, a bearing surface for the ratcheting element, and a spring seat for the elastic element.