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4-N-1 Machine Quilting Ruler designed by Natalia Bonner. This ruler is designed for machine quilting. Can be used on domestic or longarm machine. Ruler foot is necessary for use on domestic machine. The 4-N-1 Machine Quilting Ruler is great for machine quilting large curves, small curves or straight lines. Designed by professional machine quilter Natalia Bonner. The ruler measures 10.5" total length by 4.75" total width. The straight line edge measures 8". The curve on the top side of the ruler is 2" and the two smaller end curves measure 1.25". The ruler is made from high-quality acrylic and measures .25" thick.