The ornamental design for a razorblade handle, as shown and described.
FIG. 1 is a top plan view of the razor blade handle showing my new design,
the broken line showing of the razor blade being for illustrative purposes
only and forming no part of the claimed design;
FIG. 2 is a bottom plan view of the handle;
FIG. 3 is a front view of the handle; and,
FIG. 4 is a left side view of the handle, the right side being a mirror
image thereof and with the razor blade again being shown in broken lines
for illustrative purposes only.