Features: Effortlessly install these not drill shelf supports with auto tapping screws and adhesive backed designs , eliminating wall damage while delivering 50% strong load bearing capacity than standard plastic brackets for secure shelving in any space. Combining strong iron cores with effect resistant plastic casings, these erosion resistant shelf brackets feature built in anti slip grooves and accommodate 10 25mm thick boards for versatile furniture customization. Ideal for renters seeking temporary solution, homeowners preserving wall , and enthusiasts upgrading storage systems in closets, offices, or garage workshops. Perfect for reinforcing sagging bookshelves, organizing kitchen pantries, creating adjustable display units in retail stores, or adding extra storage in and tiny homes. child safe with not toxic materials and rounded edges, these shaking proof supports maintain shelf alignment even in prone areas while resisting humidity in bathrooms up to 80% . Specifications: Component : Iron + plastic Size: about 4x25mm/0.16x0.98inch Package Includes: 20xShelf Brackets Or 40xShelf Brackets note: 1.Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. 2.Due to the difference between different monitors, the picture may not reflect the actual color of the item.