ROBERTS Universal Seam Cutter is designed for top and bottom cutting of loop pile carpet for proper seaming. Easy to use, it offers the advantage of an extra-long nose for better row separation, a blade angle that delivers clean, precise cuts and the flexibility to accommodate both carpet and trimmer blades. When top cutting, point the cutter downward, pressing the tip down to pierce the carpet's backing, using it along rows making sure that the carpet seams are at the right angles to the padding seams. When bottom cutting, use the blade's angle to cut from the carpet's backing to prevent shearing and wadding up of yarns. The 1-piece durable nylon construction offers long-lasting performance and reliability.