The ornamental design for spring clamp tips, as shown and described.
FIG. 1 is a perspective side view of spring clamp tips in an open position;
FIG. 2 is a side elevational view of the spring clamp tips in an open position;
FIG. 3 is a top plan view of the spring clamp tips;
FIG. 4 is a front side elevational view of the spring clamp tips;
FIG. 5 is a side elevational view of the spring clamp tips in a closed position; and,
FIG. 6 is a front side elevational view of the spring clamp tips in a closed position.
The broken lines immediately adjacent the shaded areas represent the bounds of the claim and all other broken lines are for illustrative purposes only. None of the broken lines form a part of the claimed design.