Audrey's No-Wobble Ruler provides a specialized solution for to achieving precision with diagonal seams. This 4.5-inch square acrylic ruler features a unique recessed groove designed to straddle seams, eliminating the common rocking or pivoting that occurs with standard flat rulers. Manufactured in the USA, it includes a safety edge to protect fingers during rotary cutting, ensuring a perfect square every time. The precise grid markings allow for accurate trimming of fabric blocks. Paper with photos on how to use are not included. For info only Brand: Audrey's Sewing Basket Model: No-Wobble Ruler Material: Acrylic Shape: Square Size: 4.5" x 4.5" Feature: Recessed Diagonal Groove Feature: Finger Safety Edge Application: Quilting, Sewing, Fabric Trimming Type: Specialty Ruler Keywords: Quilting Supplies, Patchwork Tool, Rotary Cutting, Seam Guide, Acrylic Template, Sewing Accessory, Precision Crafting, Fabric Ruler, Half Square Triangle, HST Trimming, DIY, Made in USA, Sewing Basket