Two piece Stainless Steel Hood Vent Chimney. Still wrapped in white plastic protective sheeting. Brand New. One has vent groves one is solid. I just finished building my kitchen and decided to make my own Hood Vent Chimney to match my cabinets. So I never used the chimney pieces that came with the hood vent. Each piece measures 15.75" tall, 11" deep and 12" wide. They slide within each other. If you happen to be building your own kitchen and the chimney you have doesn't reach the ceiling these may work for you as the extension pieces most hood vent manufactures require you to buy are well over $100 and need to be specially ordered. $50 and they are all yours.