This is HPC PTT-4 Pin Tumbler Tweezers For Re-Keying.

The groove in the tip of the Pin Tumbler Tweezers provides a firm, non-twisting grip on cylinder pins for easy loading. The tip is also milled back so that the outside diameter of a standard .115″ (2.92mm) pin extends past the tip. This permits the pin to butt up against the end of the plug follower when loading the upper chambers, providing added control when holding top or master pins of varying lengths.