The Atco QX Scarifier 20" Cassette transforms your mower into a powered raker which rakes up debris & moss from the lawn keeping it clean & healthy. Simply remove the standard cassette & fit this one. The Atco QX Scarifier 20" Cassette is compatible with the following models: Atco Balmoral 20 S Atco Balmoral 20 SK Atco Balmoral 20 SE