Elna Bobbin Cover Slide Plate.
Made out of clear plastic for clear visability to the bobbin so you can see how much thread you have left before it runs out. It clips or slides into place and covers the bobbin to stop it jumping out, without this Bobbin cover plate the machine will not stitch correctly without it.
Will fit the following Elna models: 320/340/520/540/5100/5200/5300/6003/6200/6600/8007/8600
Please note: The product may differ from the photo used.