Quilting Ruler Feet with Slit: one of the ruler feet is designed with , so you can change a sewing foot without having to cut the thread, this allows an easy transition from ruler work to other applications Quilting Ruler Feet: these ruler feet allow you to sew along a 1/4 inch thick quilting ruler and create decorative quilt such as lines, feathers and circles High Quality: these quilting feet are made of zinc alloy, strong and sturdy, adequate quality to provide you with long term service Designed with Notches: the ruler quilting foot is designed with notches on the front and left sides, gives a view to the needle penetration point when stitching, and allows you to thread more easily