Specifications:- Upper Bracket Dimension(LxWxH) 2 15/16" x 4 1/8" x 3 15/16" (7.4 x 10.5 x 10 cm)- Bottom Bracket Dimension(LxWxH) 3" x 4 1/8" x 3 1/2" (7.6 x 10.5 x 11.5 cm)- Flat Plate Size(LxW) 4 1/8" x 4 1/8" (7.6 x 7.6 cm)- Inner and Outer Diameter 2 3/16", 2 5/16" (5.5 cm, 5.8 cm)- Sleeve Inner Diameter 1 1/4", 1 1/2", 1 7/8" (3.2 cm, 3.8 cm, 4.8 cm)- Fits Pole Diameter Up to 2 5/16" (5.5 cm)- Net Weight 2.3 Lbs (1.05 kg). Package Contents:- 2x Umbrella Holder Brackets- 8x Screws- 4x Lobe Knobs- 1 Set of Sleeves- 1x Manual