The HoopKeyDoo is the perfect tool for machine embroidery on your Bernina. Using the HoopKeyDoo, you will be able to easily tighten your embroidery hoops, even with thick material and stabilizer. Many people are buying two to accommodate their MegaHoops. You will love these finger saving tools. This product is individually packaged, labeled and ready to be hung on the display rack provided. Compatible with all Bernina hoops – excluding the Jumbo Hoop.