Product Number: SE-300 Specifications: Size: Outer Diameter: 9.0mm x Inner Diameter: 4.3mm x Height: 9.0mm Material: Brass Features: An eyelet that can be attached without punching a hole. This product is compatible with needle detectors. *Please use the dedicated die and press machine. You can set and attach the ring directly without punching a hole, but it may not be possible depending on the thickness of the fabric, so be sure to test it on the fabric you will be using. If you cannot attach it properly, please make a hole in the fabric beforehand and then attach the eyelet.