Materials, expandable under cabinets shelf make from materials, full of durability Multifunctional, you can store and attach these any where under the counter, in cabinets, bookshelves, desks and even in the wardrobes perfect for kitchen,, bedroom, bathroom and garage it is a perfect choices for under cabinets storage organizers and storage Expandable and not assembly required, this under shelf rack can be adjusted in length to suit your needs, the rack extends smoothly without any jamming it features a bottom detachment designs, ensuring remain securely in place even when fully extended the rack does not need to be assembled and can be used immediately [ Please Note] Please ensures this rack fit the space you intend for before purchasing detailed, including the size of the hook / arms ( which are suitable for shelf up to 0.98 inches Stable and not inclined, the adjustable basket height allows undershelf storage basket and cabinets integrate, making the basket more stable it will not tilts or fall