The ornamental design for an adjustable squareblade, as shown and described.
FIG. 1 is a front, top, right side isometric view of an adjustable square blade in accordance with the design;
FIG. 2 is a front elevation view of the adjustable square blade of FIG. 1;
FIG. 3 is a rear elevation view of the adjustable square blade of FIG. 1;
FIG. 4 is a right side elevation view of the adjustable square blade of FIG. 1;
FIG. 5 is a left side elevation view of the adjustable square blade of FIG. 1;
FIG. 6 is a top plan view of the adjustable square blade of FIG. 1; and,
FIG. 7 is a bottom plan view of the adjustable square blade of FIG. 1.
The adjustable square blade is shown with a symbolic break in its length. The appearance of any portion of the article between the break lines forms no part of the claimed design.