This is an Authentic Arnold Power Rake part, a universal Power Rake blade for Most 21 in., 22 in. and 23 in. Walk-Behind Mowers. This blade dethatches, bags, rakes, scalps, mulches and cuts lawns all with one handy set. The tough nylon lines are easy to adjust. This kit includes blade with sizers to fit 3/8 in., 7/16 in. and 5/8 in., universal center hole patterns attachments and dethatching line.