MN - 24" Strip Ruler with multiple different widths slots
https://www.topshelfquilts.com/shop/str-12-24-s-mn-24-strip-ruler-with-multiple-different-widths-slots-7231
https://www.topshelfquilts.com/web/image/product.template/7231/image_1920?unique=d9385a1
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