Ratchet wrench

A ratchet wrench comprising:

• a handle including a driving head provided thereon, said driving head including a chamber formed therein, and including a recess formed in said driving head and communicating with said chamber of said driving head, and including a first peripheral groove and a second peripheral groove formed in said driving head and communicating with said chamber and said recess of said driving head, and including a projection extended into said recess of said driving head for forming and defining a compartment and a space in said recess of said driving head,
• a first retaining ring and a second retaining ring engaged into said first and said second peripheral grooves of said driving head respectively and extended through said recess of said driving head,
• a driving member including a body element rotatably received and engaged in said chamber of said driving head, and including a gear formed and provided on said body element and faced and directed toward said first and said second peripheral grooves and said recess of said driving head and said first and said second retaining rings, and
• a pawl including a shaft received and engaged in said compartment of said recess of said driving head, and including a lever arm extended from said shaft and extended into said space of said recess of said driving head, and including at least one tooth formed and provided on said lever arm for selectively engaging with said gear of said driving member and for determining a driving direction of said driving member by said driving head and said handle, said shaft including a height greater than that of said lever arm and extended beyond said lever arm for forming and defining a first end segment and a second end segment and for forming and defining two engaging surfaces on said first and said second end segments respectively, and for engaging with said first and said second retaining rings respectively and for allowing said first and said second retaining rings to apply a spring biasing force onto said first and said second end segments of said shaft of said pawl respectively, and for biasing and forcing said at least one tooth of said lever arm to engage with said gear, and
• said at least one tooth of said lever arm being forced to engage with said gear of said driving member when said driving head and said handle are rotated and driven in a driving direction for allowing said driving member to be rotated and driven by said driving head and said handle in the driving direction, and said at least one tooth of said lever arm being allowed to be moved away from said gear of said driving member and to be selectively received and engaged in said space of said recess of said driving head when said driving head and said handle are rotated and driven in an opposite releasing direction, for allowing said driving head and said handle to be rotated freely relative to said driving member in the opposite releasing direction.