The product is a 3 pack lot of 2U 19" vented network rack mount server panel fillers from responseAV. Made of steel, these spacers are designed to fill in empty spaces in server racks to help organize and support network equipment asssuring needed air flow. With a sturdy construction and the ability to fit into standard 19" racks, these fillers are essential for optimizing server rack layouts and ensuring a neater, more efficient setup for various networking needs. Fast shipping!