The Ideas C3898 4 1/2 x 4 1/2'' square patchwork ruler is the precision inch tool ideal for cutting and squaring up small square blocks. Made of rigid, transparent acrylic with exact measurements of 4.5 x 4.5 inches, it features 45-degree diagonal lines and clearly visible fractional graduations on light or dark fabrics. Its transparency allows you to isolate specific patterns in the center of the square before cutting. It's the perfect template for assembling dahlia blocks, half-square triangles, and small geometric quilting compositions.