Accurate Dimensions: the adapter is designed to fit a 3 inches/7.62 cm round lamp post suitably; It has a top diameter of 2-3/8 inches, a tail outer diameter of 3.5 inches/8.89 cm, and a tail inner diameter of 3.22 inches/8.18 cm; Please note these measurements to it fit for your lighting project Rust and Protection: this round pole tenon adaptor is built from quality steel known for rust and resistance; It assures its potency irrespective of the weather, providing a firm integration between the light post and the light Heavy Duty and Strength Construction: our 3 inches tenon slip fitter adapter boasts of quality steel pipe fabrication and meticulous welding by skilled professionals; Such a robust build ensures that the adapter can back up the lighting fixtures and can withstand prolonged use, diminishing the need for constant repairs and substitutions Effortless Installation: the installation, dismantling, and replacement processes for the outdoor vertical mount bracket adapter are straightforward, accompanied by 6 bolt fixtures; It can be applied on wooden, steel, or concrete poles, facilitating a convenient DIY project without the need for additional tools Versatile Application: this round column adapter bracket is crafted to be applied on aluminum, steel, and concrete poles; It is ideal for mounting shoebox lights, LED street lights, floodlights, parking lot lights, lawn lights or other outdoor lights, offering exceptional flexibility for all your commercial outdoor illumination needs, Weight: 3.86580576417 Pounds, Manufacturer: Jaywool