FIG. 1 is a perspective view of a caster showing my new design;
FIG. 2 is a front elevation view thereof;
FIG. 3 is a left side elevation view thereof;
FIG. 4 is a top plan view thereof;
FIG. 5 is a right side elevation view thereof;
FIG. 6 is a bottom plan view thereof; and,
FIG. 7 is a rear elevation view thereof.
The broken line showing of a caster wheel and support plate is for illustrative purposes only and forms no part of the claimed design.