The cabinet storage rack is made of durable wood and metal.The simple structure and pre-drilled holes of the small shelf make its assembly easy.The hardware packet includes screws, allen wrench and an instruction manual.Durable and sturdy enough for kitchen appliances or daily use items.This countertop organizer comes with little rubber self-adhesive feet to protect your table surface and prevent sliding.High shelves can be stacked on the low shelves to be used as two-tier shelf to maximize vertical space, or as straight line high and low shelves to tier displays, or an L-shape small corner shelf to fit any space. Flexible adjust the cabinet shelf to meet your storage needs. The low small shelf can be used alone, while high shelf must be placed on top of low shelf. It’s space-efficient yet offers ample storage, keeping countertops neat and organized. This two-tier countertop organizer is a great way to maximize space in any kitchen, home office,bar or coffee station.The shelf simple design makes it easy to wipe and has no complex gaps, making it suitable for oily kitchens or damp bathrooms