This acrylic triangle ruler comes in 4 sizes and can cut multiple layers simultaneously. It has a keyhole to protect the ruler, measures strips, slides easily over fabric, and holds fabric in place. Perfect for patchwork and quilting projects. Features: 1. 6 inch, 8 inch, 10 inch, 18 inch optional, meet your different demands. 2. Turn round the ruler to cut three 90 degree triangles. Multiple layers can be cut at one time. 3. The key hole in the ruler enable the rotary cutter to cut past the strip without damaging the ruler. 4. Use the straight side of this double ruler to cut 1-1/2 and 2-1/2 inch strips, or use the pre-cuts that are on the market. 5. Slides easily over the fabric until pressure is applied, holds the fabric in place while cutting, eliminating miss-cuts. Specification: Material: Acrylic Color: Transparent Size: 6 inch, 8 inch, 10 inch, 18 inch Weight: 44g, 63g, 83g, 190g Package Included: 1 x 90 Degree Double Strip Ruler