The Allett 17 inch de thatcher quick change cartridge is part of the Allett complete lawncare system. The de thatching cartridge is suitable for the Allett Kensington 17K cylinder lawn mower.De thatching your lawn removes dense thatch allowing the soil the extra nutrients it needs for thicker and healthier growth. This Allett 17 inch diameter de thatching cartridge will penetrate the soil up to 6mm in depth and has wide spaced thick tines.