A combination locking device comprising:- a housing; a spindle axially movable within said housing and having a plurality of recesses formed therein; a plurality of annular dials accessible through said housing for manipulation by an operator, the dials having a plurality of markers visible on an external surface thereof and having a plurality of recesses, associated with said markers, on an internal surface; a plurality of gate wheels each having at least one aperture (38, 40) extending therethrough providing a pathway between said spindle and said internal surface of said dials; a plurality of first locking members for allowing and preventing rotation of said spindle relative to said gate wheels; and a plurality of second locking members located within said apertures, wherein said spindle is movable to produce a plurality of device conditions including: a locked condition wherein said gate wheels are rotatable around said spindle and said apertures (38,40) are not aligned with said spindle recesses so that said gate wheels are locked to said dials by said second locking members and a code change condition wherein said gate wheels are locked to said spindle by said first locking members and said apertures (38,40) are aligned with said spindle recesses so that said second locking members can move thereby allowing said dials to move relative to said gate wheels. a housing; a spindle axially movable within said housing and having a plurality of recesses formed therein; a plurality of annular dials accessible through said housing for manipulation by an operator, the dials having a plurality of markers visible on an external surface thereof and having a plurality of recesses, associated with said markers, on an internal surface; a plurality of gate wheels each having at least one aperture (38, 40) extending therethrough providing a pathway between said spindle and said internal surface of said dials; a plurality of first locking members for allowing and preventing rotation of said spindle relative to said gate wheels; and a plurality of second locking members located within said apertures, wherein said spindle is movable to produce a plurality of device conditions including: a locked condition wherein said gate wheels are rotatable around said spindle and said apertures (38,40) are not aligned with said spindle recesses so that said gate wheels are locked to said dials by said second locking members and a code change condition wherein said gate wheels are locked to said spindle by said first locking members and said apertures (38,40) are aligned with said spindle recesses so that said second locking members can move thereby allowing said dials to move relative to said gate wheels. a locked condition wherein said gate wheels are rotatable around said spindle and said apertures (38,40) are not aligned with said spindle recesses so that said gate wheels are locked to said dials by said second locking members and a code change condition wherein said gate wheels are locked to said spindle by said first locking members and said apertures (38,40) are aligned with said spindle recesses so that said second locking members can move thereby allowing said dials to move relative to said gate wheels.