The present invention relates to a ratchet wrench including a wrench with one end provided with a pivot hole; a turning knob disposed in the pivot hole of the wrench and containing a dial; a wheel member disposed to the handle of the wrench and containing also a dial; and a turning member with one end...http://www.google.com/patents/US7331259?utm_source=gb-gplus-sharePatent US7331259 - Ratchet wrench
