Breaker bar

A breaker bar comprising:

• a rod unit including
• a rod, and
• a mounting seat that has a base portion connected to an end of said rod, and two spaced-apart support arms extending from said base portion, said base portion and said support arms cooperatively defining a mounting space, said base portion having a first engaging section that is disposed between said support arms and that faces said mounting space, each of said support arms having a piercing extending therethrough along an axial line;
• a connector member rotatably connected to said mounting seat, and having a connector head that has
• a head body disposed in said mounting space, rotatable about the axial line, and having two outer surfaces that are respectively disposed adjacent to said support arms, a through hole that extends through said outer surfaces in the axial line, and a surrounding surface connected between said outer surfaces, and
• a second engaging section connected to said head body, and being in direct contact with and rotatable relative to said first engaging section;
• and
• a fastening set including a fastening member that extends in the axial line through said piercings of said support arms and said through hole of said head body and that fastens said connector head to said mounting seat;
• wherein said first engaging section of said mounting seat defines a recess;
• wherein said second engaging section of said connector head is a protrusion that extends curvedly and outwardly from said surrounding surface into said recess;
• and
• wherein said second engaging section is concentric with said surrounding surface.