For Use With Kenwood Chef Model FP580 - Only - Model Numbers can be found on the base of your Liquidiser/Blender You can not use a ridged seal on a machine that uses a smooth seal & you can not use a smooth seal on a machine that uses a ridged seal.
Kenwood FP580 Ridged Sealing Ring
Kenwood FP580 Ridged Sealing Ring Pack Of 3 - ETDX0HVI