1. Cantonera (1) tray, wherein the tray comprises a base (2) with chamfered corners and flaps (3) forming the sides of the tray, characterized in that the butt plate (1) comprises: - a monolithic angular part ( 4) which in turn comprises two orthogonal side channels (5) each other, wherein the side channels (5) are formed by an inner wall (7) and an outer wall (8), - flanges (12) at the end the outer wall (8), and - a central projection (13), wherein the side channels (5) are embedded in the flaps (3), the central projection (13) is fixed to the chamfered corner of the base (2 ) and tabs (12) are fixed to the flaps (3) of the tray by welding or by adhesive. 2. Cantonera (1) to tray according to claim 1, characterized in that the outer wall (8) comprises a plurality of vertical ribs (9) which increase the rigidity of the monolithic angular part (4). 3. Cantonera (1) to tray according to any of the preceding claims, comprising a vertical channel (6) in the corner of the monolithic angular part (4) which match the side channels (5). 4. Cantonera (1) to tray according to any of the preceding claims, wherein the inner wall (7) and the outer wall (8) are joined by a supporting surface (10) along the entire monolithic piece (4 ). 5. Cantonera (1) to tray according to any of the preceding claims, characterized in that it comprises a perimetral skirt (11) which is an extension of the outer wall (8) such that the perimetric flap (11) guide the support of a buttplate (1) over another. 6. Cantonera (1) to tray according to any of the preceding claims, characterized in that the tabs (12) comprise an L-shaped configuration, where the short leg of the L is fixed to the outer wall (8) of the retaining bracket monolithic (4), and the long limb of the L is fixed to the flap (3) of the tray. 7. Cantonera (1) to tray according to any of the preceding claims, characterized in comprising a tongue and groove, comprising a shoulder (14) in correspondence with the vertical channel (6). 8. Cantonera (1) to tray according to claim 7, characterized in that the projection (14) is located on top of the monolithic angular part (4). 9. Cantonera (1) to tray according to claim 7, characterized in that the projection (14) is located at the bottom of the monolithic angular part (4). 10. Cantonera (1) to tray according to any of the preceding claims, wherein the inner wall (7) is shorter than the outer wall (8). 11. Cantonera (1) to tray according to any of claims 1 to 9, characterized in that the inner wall (7) is the same length as the outer wall (8). 12. Cantonera (1) to tray according to any of the preceding claims, comprising an insert (15) on the monolithic angular part (4) to separate two plates located one on another. 13. Cantonera (1) to tray according to claim 12, wherein the insert (15) comprises a U cross section, the branches of the U corresponding to the inner wall (7) and the outer wall (8) the monolithic angular part (4) and the web of the U forms a support surface (16). 14. Cantonera (1) to tray according to any of claims 12 or 13, characterized in that the branch of the U is in correspondence with the outer wall (8) of the monolithic angular part (4) comprises extensions (17) reproduce the vertical ribs (9) of the outer wall (8) of the corner fitting (1) and placed in these vertical ribs (9). 15. Cantonera (1) to tray according to any of claims 12 to 14 wherein the insert (15) comprises a vertical channel (18), a shoulder (19) and a perimetric flap (20) facilitates placement of the supplement ( 15) on a monolithic (4) or other supplements (15) in cooperation with extensions (17) part.
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