Material: The shelf supports are made of high quality solid zinc alloy construction to ensure quality and longevity. Polished surface finish for a comfortable touch. Bracket size: L*W*H: 56 mm*24 mm*50 mm/2.2 in*0.95 in*1.97 in. Suitable for 2-23 mm / 0.07 in - 0.90 in thick wood or glass panels Scope of application: modern style, suitable for indoor and outdoor use, such as bookshelves, exhibition stands, external wall brackets, shops, workshops, etc. Package contents: 4 Adjustable Shelf Brackets, 8 anchorages, 8 screws. Easy to install: use the supplied fixings to fix the screws to the position where they need to be installed, then adjust the gap between the jaws and finally clamp them to the shelf using the screws located at the bottom of the bracket.