Allett 20 inch Quick Change scarifier cassette. Simply remove the standard cutting cylinder from your lawnmower, insert this 20 inch scarifying cartridge, & your Allett cylinder mower is immediately transformed into a powered lawn scarifier This will clear your lawn of moss, thatch & other debris, allowing it to breath & promoting new growth. Suitable for the Allett Kensington 20K Expert cylinder mowers & the ATCO Balmoral 20SK petrol cylinder mowers.