For use with 1000 series sewing machines when greater visibility is required in a darning of freehand embroidery, monograms and outline quilting. 
This foot is very similar in design to the darning Foot 9. However, its sole is open in the front for improved visibility. 
You can see the needle more clearly while stitching. 
Combined with Bernina's Hopper Mechanism, this foot gives excellent fabric control (no flagging) while the stitches are being formed as well as the ability to move the project freely under the foot.