3 Sizes: The template set includes 3 size: about 141~258mm wide, 141~258mm long, 3mm thick, hole: 5~10mm. Please refer to the picture for detailed information Reliable Material: The octagon quilting template ruler is made of acrylic material, which is wear-resistant and durable, clear and transparent. Smooth Edges: The corners and edges of the octagon template are carefully polished, smooth and flat, and will not cut your hands. For Marking- The template has holes at the corners for easy marking of seam allowance, with a hole diameter of 5~10mm, create the perfect pattern for your quilting and sewing projects. Wide Applications: Acrylic templates are suitable for sewing, piecing, quilting, mending, patching, bordering, binding, and weaving projects.