What is the primary purpose of round-nose pliers?

Round-nose pliers are specifically designed for bending and shaping wire into curves and loops, making them an essential tool in various applications, including jewelry making and craft projects. The rounded tips allow the user to create smooth curves without damaging the wire, which is critical for maintaining the integrity of the material. This functionality is vital when working with delicate wire that needs to retain its shape and strength, thus highlighting the primary purpose of round-nose pliers.

Other functions of tools mentioned in the question incorporate distinct types of pliers or tools that serve different purposes, such as cutting or holding objects. Each tool has its unique design and intended function, which emphasizes the versatility and specialized use of round-nose pliers.