The SA170 set, was adapted especially for use on the Brother PQ-series machines and includes three sizes – 2mm, 5mm(1/4th inch), and 8mm. These convenient feet are equipped with durable metal guides that hold the fabric securely for perfect edge-stitching and topstitching, yet are equipped with spring action for easy transition to standard sewing.The guides are self leveling, there is no need to change feet to change sewing operations. These feet are inspired by the industrial compensating feet.