that are used to match the faces of the drywall end the preferred total angle between the flanges is around 88 degrees however many other angles are within the scope of the present invention optional tabs 2 are seen on each of these flanges these optional tabs 2 can be used to align drywall trim pieces into the corner an expansion channel 4 opening into a relief area 3 can also be clearly seen the preferred size of the channel is around 0 13 inch however any convenient size can be used as the flanges 1 are fitted over the drywall corner each flange can expand or contract along a separate expansion channel 4 and relief area 3 so that the drywall corner piece fits over the outside corner snugly the piece can be made of any material with plastic being preferred optional holes 5 can be formed in the piece to allow better adhesion to drywall mud the preferred size of the stain relief hole 3 is around 0 63 inches with many other sizes of hole being within the scope of the present invention fig2 a and 2b show a part similar to that of fig1 a and 1b.