The ornamental design for a low-profile threshold of a safetygate, as shown and described.
FIG. 1 is a perspective view of a low-profile threshold of a safety gate showing my new design;
FIG. 2 is a front elevation view thereof;
FIG. 3 is a rear elevation view thereof;
FIG. 4 is a left side elevation view thereof;
FIG. 5 is a right side elevation view thereof;
FIG. 6 is a top plan view thereof;
FIG. 7 is a bottom plan view thereof;
FIG. 8 is an enlarged left side elevation view thereof;
FIG. 9 is an enlarged right side elevation view thereof; and,
FIG. 10 is an operational perspective view thereof.
The broken lines shown are included for the purpose of illustrating environment and unclaimed portions of the article and form no part of the claimed design.