Specifications:- Overall Dimension(LxWxH) 3 7/8" x 3 7/8" x 11 5/8" (9.9 x 9.9 x 29.5 cm)- Tube Inner and Outer Dia. 2 1/8", 2 1/4" (5.4 cm, 5.7 cm)- Base Plate Thickness 1/16" (2.2 mm)- Fits Pole Dia. 1 1/4", 1 1/2", 1 7/8" (3.2 cm, 3.8 cm, 4.8 cm)- Material Stainless Steel- Net Weight 2 Lbs (0.9 kg). Package Contents:- 1x Base Plate- 3x Hole Rings- 4x Wood Screws- 4x Expansion Bolts- 2x Knobs- 1x Manual