I recently purchased this online, but it didn't fit the thread winder lever on my JUKI SL-700EX, so I couldn't use it. The description stated that it could be used with sewing machines from various manufacturers such as JUKI, Brother, Janome, and Singer, but it didn't work with my JUKI. If anyone can use it, please feel free. [Product Specifications] Outer Diameter: 20.8mm Inner Diameter: 6mm Thickness: 9mm Groove: Yes Material: Aluminum