Fons & Porter 1/4″ seam marker is a nifty tool! Mark 1/4-inch sewing lines on patchwork pieces with this nifty set of tools. Two piece tool set includes 1-8″ and 1-12″ tool. It is a quick and easy method for half-square triangles and hourglass units. Features an acrylic construction with easy to follow black and yellow markings. Instructions for two patchwork blocks are included.