The length of this microwave shelf is expandable from 15.7″ to – 23.6″ (40cm-60cm). There are also small holes in different heights thus you can adjust the rack height through different holes when you install it. Adjust its size according to your needs to easily store a microwave oven or other kitchen appliances, and save more space. Made of durable thick carbon steel, also painted by ecological black paint, it is heat resistant and anti-rust. This microwave shelf rack is suitable for your kitchen, and any other storage areas such as shower room, wardrobe, garage, etc. It comes with 3 bonus hooks to store oven mitts, kitchen utensils, or hand towels.