The ornamental design for a securitydoorgrill, as shown and described.
FIG. 1 is a perspective view of a security door grill of our new design, with portions of the door structure and screen illustrated in broken lines to provide environmental structure;
FIG. 2 is a front elevation view thereof;
FIG. 3 is a rear elevation view thereof;
FIG. 4 is a right side view thereof;
FIG. 5 is a left side view thereof;
FIG. 6 is a top view thereof; and,
FIG. 7 is a bottom view thereof.
The broken lines depict portions of the security door grill that form no part of the claimed design.