One piece unit- no assembley required.  Comes ready to use,  just unfold and pop in the wheels.  Frame is  constructed of 3/4" powder-coated steel tubing; body is heavy gauge powder-coated steel wire mesh. Lockable, hinged cover.  Lock Not Included. Heavy duty multi-directional wheels.  24" W x 42" L x 36" H , weighs 50 lbs.