Ozest is a concave speed zester that instantly cleans itself with the push of a button. A clean slate Instantly cleans and clears itself of any clinging zest with the push of a button. Close contact Concave grater plate increases contact area for faster zesting, and guides your food down its centre for safer, more efficient strokes. 441 good reasons 441 super fine blades are photo-etched and perfectly angled to create fluffier and more aromatic zest without the bitter pith. Measuring. Covered Protective blade cover snaps or slides on for worry-free storage, and doubles as a zest catcher, measuring up to 2 tbsp.