Create custom designs with the Wubbers small square mandrel pliers. These unique pliers can be used for shaping, coiling, wrapping wire and sheet metal. These pliers will create square shapes. They could be used to make interesting jump rings. The small square mandrel pliers are for use with up to 16-gauge wire or finer, as well as 24-gauge sheet or lighter. These pliers are handcrafted for superb quality and engineered for comfort and control. These pliers make square rings with inside diameters of 3mm and 5mm. The outside diameter will change depending on what gauge of wire you use.