The rounded notches on the front guide help this cutter find rows in difficult carpets including Berbers, hydrashift, and commercial level loop. Takes standard slotted razor blades. The offset blade clamp allows fast blade depth adjustment and blade changes. For best results, trim WITH (in the direction of) the nap sweep. Beginning at a starting point on the left side of the seam, trim with a blade down on the left side of the cutter. Return to this same starting point on the right side of the carpet and trim with the blade down on the same (left) side of the cutter, moving down the seam in the same direction. This procedure simulates the factory spacing of the carpet’s rows on most carpets. When necessary, to trim both edges as close as possible to the tufts, trim the right side of the seam with a blade down on the right side, then for the left side retract the right blade and trim with the left blade down. Net weight: 8 oz.