The ornamental design for a “impact socket,” as shown and described.
FIG. 1 is a perspective view of a impact socket, showing my 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 right side elevational view thereof;
FIG. 6 is a top plan view thereof; and,
FIG. 7 is a bottom plan view thereof.
The broken line showing of an interior of the impact socket, within an innermost circular feature, and including a square drive end and a double square drive end, show unclaimed subject matter only and forms no part of the claimed design.