FIG. 1 is a first perspective view of a first embodiment of a caster showing our new design;
FIG. 2 is a second perspective view thereof;
FIG. 3 is a front view thereof;
FIG. 4 is a back view thereof;
FIG. 5 is a top view thereof;
FIG. 6 is a bottom view thereof;
FIG. 7 is a right view thereof;
FIG. 8 is a left view thereof;
FIG. 9 is an enlarged sectional view indicated in FIG. 3;
FIG. 10 is a first perspective view of a second embodiment of a caster showing our new design;
FIG. 11 is a second perspective view thereof;
FIG. 12 is a front view thereof;
FIG. 13 is a back view thereof;
FIG. 14 is a top view thereof;
FIG. 15 is a bottom view thereof;
FIG. 16 is a right view thereof;
FIG. 17 is a left view thereof; and,
FIG. 18 is an enlarged sectional view indicated in FIG. 12.
The broken lines shown in the figures show portions of the caster that form no part of the claimed design.