Specifications: High quality material is corrosion and oxidation resistant. It features punch-free installation, strong adhesive, and non-destructive removal. Please install and use it after the glue has solidified for 72 hours. It is easy to accommodate the umbrella, easy to drain, and save space. Item Name: Umbrella Holder Material: Space Aluminum, ABS Features: Easy to Install, Single/Two Tier, Strong Single Tier Size: 20cm x 6cm x 5cm/7.87" x 2.36" x 1.97" (Approx.) Double-Tier Size: 20cm x 6cm x 13cm/7.87" x 2.36" x 5.12" (Approx.) Notes: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Package Includes: 1 x Umbrella Holder 1 x Nail-free Glue 1 x Assistant Sticker