This elegant and clean shelf from ingenative is designed as undermount desk organizer , which allows users to utilize the desktop space . It is made of aerospace grade aluminum alloy. The product surface is anodized for smooth edges and durability. Compared to the steel products, this aluminum alloy shelf is light weight , high strength and much better in thermal performance or heat removal. 50x50 cm screw mounting features are included for CPU fans, which is great for high heat dispersion electronic. CPU fans are sold separately. The shelf fits laptops up to 17 inches and perfect for Mac mini. The 3 inch height design is optimal for leg rooms under the table. Required desktop thickness greater than 1/2 inch for stability. Included double sided tape is for installation assistance, not for long term or heavy load mounting. Never place load on the shelf without screw reenforcement.