Patio Umbrella Holder with 2 separate brackets can be flexibly mounted to deck railings, providing support to patio umbrella without taking up floor space With 3 sleeves to fit a range of pole sizes from 1 1/4' to 2 5/16' Crafted by sturdy powder-coated steel for rust resistance, tough enough to withstand outdoor elements Fix brackets on the railing or wall with screws, insert the pole, and tighten the knobs Upper & Bottom Bracket Dimension(LxWxH) 2 15/16' x 4 1/8' x 3 15/16', 3' x 4 1/8' x 3 1/2'