The ornamental design for a slider for slidefastener, as shown and described.
FIG. 1 is a perspective view of the front, top and right side of a slider for slide fastener showing my new design;
FIG. 2 is a perspective view of the front, bottom and left side thereof;
FIG. 3 is a front view thereof;
FIG. 4 is a rear view thereof;
FIG. 5 is a right side view thereof, the left side view being mirror image thereof;
FIG. 6 is a top plan view thereof;
FIG. 7 is a bottom view thereof; and,
FIG. 8 is a reference view of usage.
The dash-dot line defines the boundary of the claimed design and forms no part of the claimed design. The evenly spaced broken line is for the purpose of illustrating the unclaimed portions of the slider for slide fastener and forms no part of the claimed design.