The Itty-Bitty Eights 6" square is one of a set of mini rulers designed by Lisa Bongean of Primitive Gatherings with pronounced 1/8" grid. The unique black diamond markings highlight the 1/8" and whole inch markings. The white diamonds highlight the 1/4" markings. The black dashed 1" grid guarantees accurate ruler placement – so important when dealing with minis. The black and white dashed 1/8" grid show up on both dark and light fabrics. The diagonal line extending from the corner makes squaring up half-square triangles in 1/8" increments easy! The gripper dots and gripper edge hold the ruler in place to ensure accurate cutting.