Abstract: The present invention relates to an adjustable spanner (2) having a first fixed jaw (4) and a second moveable jaw (8). The second jaw (8) can be locked in fixed relation to the first jaw (4) by a locking means (16). This locking means (16) is moveable between a first position in which the second jaw (8) is fixed in relation to the first jaw (4) and a second position in which the second jaw (8) is permitted to move with respect to the first jaw (4).

Abstract: The invention provides an adjustable spanner having one fixed jaw (11) and one movable jaw (12), the fixed jaw being mounted on or formed integrally with the body or handle (10) of the spanner, and the movable jaw being arranged to slide in the body or handle of the spanner relative to the fixed jaw, in which the movable jaw (12) is provided with a first set of serrations (15) and a locking member (17) provided with a second set of secretions (16) is movably mounted in the body of the spanner to move between a locking position in which said second set of serrations engage with said first set of serrations to lock the movable jaw (12) in an operative position, and a release position in which the second set of serrations are clear of said first set of serrations to allow adjusting movement of the movable jaw; wherein releasable locking means (21) is provided for locking the locking member (17) positively in said locking position.