Remove pusher/plunger from middle, and place the food item in the tube. Replace plunger, and push down, as shown.
If the item is very long (such as a big carrot of a full stalk of celery), cut it in half, first.
Wash by hand (dishwasher is not recommended).
Dimensions: The tube itself is 11 cm (about 4.5") long (not including the plunger), and is an oval shape, about 5 by 6 cm (2 x 2.25") wide, inside.
Warnings:Do not use on foods with pits. (Or, if you want to slice or quarter a pitted fruit or vegetable such as an avocado, remove the pits first, before placing the rest in the tube, so as not to damage or jam the unit.)