This easy-to-use ear wire jig makes it easy to make repeatable, consistently sized kidney-style ear wires. This tool is NOT used in a hydraulic press. Finished ear wire is approx. 7/8" long, 3/8" wide, and features an outward bend in the end of the wire and catch for a secure hold. The loop is approx. 3mm diameter. Recommended for use with half-hard 20g wire.