The ornamental design for a rotatable crank tool, as shown and described.
FIG. 1 is a right side elevational view of a rotatable crank tool showing our new design;
FIG. 2 is a front elevational view thereof;
FIG. 3 is a rear elevational view thereof;
FIG. 4 is a left side elevational view thereof;
FIG. 5 is a top plan view thereof;
FIG. 6 is a bottom plan plain view thereof;
FIG. 7 is perspective view thereof; and,
FIG. 8 is an enlargement view thereof, of which the area being enlarged is the bottom end of the tool as indicated by the broken line reference circle in FIG. 7.
In FIG. 7, the broken line showing of the drill is provided for the purpose of illustrating environmental structure and forms no part of the claimed design. Furthermore, in FIGS. 7 and 8, the broken line circle is provided as a graphical symbol to indicate the area of enlargement and also forms no part of the claimed design.