Patent ID: 8297154

Claim:
A combination wrench comprising: a shank; a first driving member mounted on a first end of the shank; and a second driving member mounted on a second end of the shank, wherein: the shank has different cross-sectional profiles and areas from the first driving member to the second driving member; the shank has different thickness from the first driving member to the second driving member; the first driving member has an upper side, a lower side, a rightward side and a leftward side; the second driving member has an upper side, a lower side, a rightward side and a leftward side; the shank has an upper side extending from the upper side of the first driving member to the upper side of the second driving member; the shank has a lower side extending from the lower side of the first driving member to the lower side of the second driving member; the shank has a rightward side extending from the rightward side of the first driving member to the rightward side of the second driving member; the shank has a leftward side extending from the leftward side of the first driving member to the leftward side of the second driving member; the distance between the upper side of the shank and the lower side of the shank is decreased gradually from the first driving member to the second driving member; and the distance between the rightward side of the shank and the leftward side of the shank is increased gradually from the first driving member to the second driving member.