The ornamental design for a spanner, as shown and described.
FIG. 1 is a perspective view of a spanner showing my new design;
FIG. 2 is a front view thereof;
FIG. 3 is a rear view thereof;
FIG. 4 is a left view thereof;
FIG. 5 is a right view thereof;
FIG. 6 is a top view thereof;
FIG. 7 is a bottom view thereof;
FIG. 8 is another perspective view thereof;
FIG. 9 is a cross-sectional view taken along 9-9 of FIG. 2; and,
FIG. 10 is an exploded perspective view thereof.
The dash-dash broken lines are included for the purpose of illustrating portions of the Ratchet spanner and form no part of the claimed design. The dash-long dash broken lines are included for the purpose of illustrating alignment and form no part of the claimed design.