A power tool, comprising: a housing; a motor disposed in the housing; an output member configured to hold a fastener-driving bit, the output member having a longitudinal axis about which it is rotationally drivable by the motor; and a holder assembly, the holder assembly comprising a leg portion configured to extend from the housing and a holder (101, 102) configured to hold a fastener; wherein the holder (101, 102) is rotatable with respect to the leg portion about an axis which is substantially perpendicular to the longitudinal axis of the output member, between a working position at or adjacent to the longitudinal axis of the output member in which the holder (101, 102) is configured to hold a said fastener in a position to be driven by a said bit held by the output member, and a non-working position further from the longitudinal axis of the output member, wherein the working position of the holder (101, 102) is a position in which most or all of the holder (101, 102) is positioned between the leg portion and the longitudinal axis of the output member; characterized in that: the non-working position of the holder (101, 102) is a position in which the leg portion is positioned between most or all of the holder (101, 102) and the longitudinal axis of the output member; and the power tool further comprises a magnet (106, 108) on the holder (101, 102) and/or the leg portion by means of which the holder (101, 102) may be retained in its working position and a magnet (105, 108) on the holder (101, 102) and/or the leg portion by means of which the holder (101, 102) may be retained in its non-working position. a housing; a motor disposed in the housing; an output member configured to hold a fastener-driving bit, the output member having a longitudinal axis about which it is rotationally drivable by the motor; and a holder assembly, the holder assembly comprising a leg portion configured to extend from the housing and a holder (101, 102) configured to hold a fastener; wherein the holder (101, 102) is rotatable with respect to the leg portion about an axis which is substantially perpendicular to the longitudinal axis of the output member, between a working position at or adjacent to the longitudinal axis of the output member in which the holder (101, 102) is configured to hold a said fastener in a position to be driven by a said bit held by the output member, and a non-working position further from the longitudinal axis of the output member, wherein the working position of the holder (101, 102) is a position in which most or all of the holder (101, 102) is positioned between the leg portion and the longitudinal axis of the output member; characterized in that: the non-working position of the holder (101, 102) is a position in which the leg portion is positioned between most or all of the holder (101, 102) and the longitudinal axis of the output member; and the power tool further comprises a magnet (106, 108) on the holder (101, 102) and/or the leg portion by means of which the holder (101, 102) may be retained in its working position and a magnet (105, 108) on the holder (101, 102) and/or the leg portion by means of which the holder (101, 102) may be retained in its non-working position. the non-working position of the holder (101, 102) is a position in which the leg portion is positioned between most or all of the holder (101, 102) and the longitudinal axis of the output member; and the power tool further comprises a magnet (106, 108) on the holder (101, 102) and/or the leg portion by means of which the holder (101, 102) may be retained in its working position and a magnet (105, 108) on the holder (101, 102) and/or the leg portion by means of which the holder (101, 102) may be retained in its non-working position.