Bernina practical Magnifying lens set sharpens your view of the work area. The set contains three magnifying lenses of different strengths, enabling you to choose the most suitable magnification for the project at hand. The lenses provide an optimum view when threading, and magnify the stitching area. This is especially helpful for precision sewing in tricky places. The magnifying lenses also make lighter work of embroidery, sparing your eyes and reducing fatigue. To be used with a separate mounting bracket.