Adjustable ratchet wrench

A ratchet wrench comprising:

• a handle having an end hole defined in an end thereof and a positioning unit being accommodated in the end hole;
• two plates clamping the handle therebetween and each plate having a mounting hole defined in an end thereof, a connection hole defined through each of the two plates;
• a pawl having two recesses defined in a rear end thereof, engaging teeth defined in two sides of a front end of the pawl, a pivotal hole defined through the pawl and a pin extending through the pivotal hole of the pawl, the two respectively connection holes and the handle, the positioning unit of the handle engaged with one of the two recesses;
• a ratchet wheel having ratchet teeth defined in an outer periphery thereof and a through hole defined through a center portion of the ratchet wheel, two contact portions extending from an inner periphery of the through hole, the ratchet wheel located in the mounting holes of the two plates and the ratchet teeth engaged with the engaging teeth of the pawl;
• two clamp members each having an extension extending therefrom, each extension having a slot defined in top and bottom thereof, the two clamp members inserted in the through hole of the ratchet wheel, the two extensions extending toward opposite directions, and
• two ring-shaped covers each having two openings defined in an underside thereof, two holes defined in a top of each of the two covers and respectively located corresponding to the openings, the two covers respectively connected to a top and a bottom of the ratchet wheel, the extensions extending through the openings, multiple pins extending through the holes and respective lower ends of the pins engaged with the slots.