Abstract: A base unit for a document shredding machine comprising a frame like supporting structure providing an open-fronted stand which provides a horizontal surface on which a shredding machine may be placed. A bin of the base unit comprises a rear portion and a front portion which is wider than the rear portion, and when the bin is located within the supporting structure, side walls of the rear portion lie between support members of the frame structure and between side walls thereof, while the side walls of the front portion project into the open front of the supporting structure, the outer surfaces of said side walls being generally flush with the outer surfaces of the side walls of the supporting structure.