Which of these instruments is specifically designed to cut fine pieces of material like pins?

The instrument specifically designed to cut fine pieces of material like pins is the pin cutter. This tool is designed with sharp edges and a narrow profile, allowing for precision cutting. Pin cutters are particularly useful in veterinary practices when dealing with small, delicate objects or materials that require specific cutting actions without damaging surrounding tissue.

In contrast, the Friedman Rongeur is engineered for grasping and cutting bone or tough tissue, making it unsuitable for fine materials. The Barraquer Eye Speculum is designed to hold the eyelids open during ocular surgeries and does not possess cutting features. The Tru-cut biopsy needle is used for obtaining tissue samples, which involves a different mechanism and purpose than that of a pin cutter. This distinction in function highlights why the pin cutter is the correct choice for cutting fine materials.