The Square on Square Trim Tool, by designer Jean Ann Wright. Create perfect 4" or 8" square on square or snail trail blocks with this trim tool. Trim each triangle as it is added. The cutting requirements are printed directly on the tool. Equipped with Creative Grid's exclusive grip, this ruler slides easily on fabric yet stays in place when pressure is applied. Use the included instructions or scan the QR code to view a video demonstration. Made in the USA.