Material: Aluminum-Magnesium Alloy 535Finish: MillRound Base Size: 3"I.D. Size: 1-3/8"Pipe Size: 1"Set Screw Size: 3/8"-16 Thread X 1/2" LengthHex Key Size: 3/16"Mounting Hole Size: 7/16"Elongated Mounting Hole Is Inside Of Fitting For Clean LookCan Be Used With Any Pipe Including Aluminum, Galvanized Steel, Stainless Steel And Black IronDesigned To Attach Pipe End To Wall, Ceiling Or FloorGreat For Interior Or Exterior RailingsHigh Corrosion Resistance