You can increase the effectiveness & precision of your Allett Kensington 20K Petrol Cylinder Lawn Mower with the Allett Expert 20" 10 Blade Cartridge. The 10 precision-engineered spiral blades are designed to create the kind of professional, defined finish you would find on the nation’s bowling greens & golf courses. Easily & fast to fit, thanks to Allett’s ‘quick cartridge’ (Qc) system, the Allett Expert 20" 10 Blade Cartridge simply replaces your standard six-blade cylinder & is just as easy to swap back when the job is done.