A ratchet wrench includes a first and a second drive members 21, 21′ rotatably mounted in a first and a second heads 16, 16′ extended from a first and a second ends of a handle 10. The first drive member 21 includes a square inner periphery 35 adapted to slidably retain a drive shaft 36 including a ½″ drive fitting 45 and a ⅜″ drive fitting 46, and the second drive member 21′ includes a ¼″ drive hexagonal bit holder 53 and ¼″ drive fitting 54, for providing combined functions of ordinary ratchet wrenches for turning fasteners. A first and a second ratcheting mechanisms are mounted in the first and the second ends of the handle 10 for turning the first and the second drive members 21, 21′, by the handle 10.