High Quality Material - Adjustable Glass Shelf Support High quality solid zinc alloy construction, ensuring quality and longevity in humidity. Impressive polished surface treatment, comfortable touch. Easy to Install - Adjustable shelf brackets on the wall, then just adjust the gap between the clamping jaws and fix it on the shelf with the screws at the bottom of the bracket . Exquisite and Durable Design - Increase the black gasket design to fix the glass and increase the friction with the glass to prevent the glass from falling, thicken the material and improve the bearing capacity. Application - Designed for the glass or wooden boards on shelf, exhibition stand, garden shelf, external wall brackets and bathroom glass shelf etc. Please note that my Amazon registered trademark is and that my seller name is "Yao Yao Know", so i hope you buy my products on my lighting interface, please check my seller name if you buy from my list i received products from other sellers , and I have disputes with me because of a p quality problem. This worries us all. I take this statement very seriously. Thank you for your patronage!