A chuck for a power tool, the chuck comprising: a chuck body extending along a longitudinal axis and defining an attachment end and a tool receiving end; a plurality of jaws, each of the jaws including a jaw end and a drive end, each of the jaws movable along a respective jaw axis between a closed position and an open position, each respective jaw axis oriented at an oblique angle relative to the longitudinal axis of the chuck body; a biasing member coupled to each of the jaws and operable to bias the plurality of jaws toward the closed position, the biasing member including a spring disposed radially between the longitudinal axis of the chuck body and the drive ends of the jaws; and a rotating assembly selectively engageable with the plurality of jaws such that, when engaged, the plurality of jaws are movable in response to rotation of the rotating assembly; wherein each of the jaws includes a first engagement portion, and the chuck is characterised in that the rotating assembly is coupled to the chuck body and rotatable with respect to the chuck body between a disengaged position, an engaged position, and a tightened position, the rotating assembly including a second engagement portion, the first engagement portion and the second engagement portion being disengaged when the rotating assembly is in the disengaged position, the first engagement portions and the second engagement portion being engaged when the rotating assembly is in the engaged position such that each of the jaws is movable along its respective jaw axis in response to rotation of the rotating assembly, and rotation of the rotating assembly from the engaged position to the tightened position moves the plurality of jaws toward the closed position. a chuck body extending along a longitudinal axis and defining an attachment end and a tool receiving end; a plurality of jaws, each of the jaws including a jaw end and a drive end, each of the jaws movable along a respective jaw axis between a closed position and an open position, each respective jaw axis oriented at an oblique angle relative to the longitudinal axis of the chuck body; a biasing member coupled to each of the jaws and operable to bias the plurality of jaws toward the closed position, the biasing member including a spring disposed radially between the longitudinal axis of the chuck body and the drive ends of the jaws; and a rotating assembly selectively engageable with the plurality of jaws such that, when engaged, the plurality of jaws are movable in response to rotation of the rotating assembly; wherein each of the jaws includes a first engagement portion, and the chuck is characterised in that the rotating assembly is coupled to the chuck body and rotatable with respect to the chuck body between a disengaged position, an engaged position, and a tightened position, the rotating assembly including a second engagement portion, the first engagement portion and the second engagement portion being disengaged when the rotating assembly is in the disengaged position, the first engagement portions and the second engagement portion being engaged when the rotating assembly is in the engaged position such that each of the jaws is movable along its respective jaw axis in response to rotation of the rotating assembly, and rotation of the rotating assembly from the engaged position to the tightened position moves the plurality of jaws toward the closed position.