This SUPER EZQuilting “Is It Square? Tool” by Marti Michell measures 10.5″ x 10.5″ and is designed to help quilters easily check for squareness and measure angles of 30°, 45°, 60°, and 90°. Made in the USA, this durable quilting ruler features clear markings and multiple angle guides for precise cutting and alignment. It is in very good condition