This is a genuine MTD replacement foam air cleaner filter designed to fit a variety of lawn trimmer and lawn tillers This air filter fits tiller and trimmer models from brands including Craftsman, Ryobi, Bolens, Troy Bilt, MTD, Yard Man, Yard Machines Dimensions: 7/8″ high, with an inner diameter of 1 1/4″ and an outer diameter of 2 1/4″ This round air filter is designed to protect your trimmer or tiller’s engine from dust and other debris