The GL1245 Edge guiding presser feet fit Pfaff 335, 1245 sewing machines. These feet allow you to follow an edge to the LEFT of the needle at a precise distance (Most people use the RIGHT version: GR1245). The spring loaded edge blade moves up and ride on top of the material when moving across seams. The feet also work when following an edge of top layer material that is inset on the bottom layer of material, like attaching a pocket or strap.