GN 145 Aluminum, Flanged Connector Clamps, with 2 Mounting Holes | JW Winco Standard Parts
Kipp Tube clamps swivel aluminum K0488.512 | Zoro
BQLZR Pipe Clamp 2-Bolt Double-Ended Clamp,Double Port Pipe Clamps Used To Mount A 1" Aluminum Pipe For Clothes Drying Racks, Shelves, Clothing Display Racks, Circular Pipe Connections - Amazon.com
Grid Clamp Reducer for Square Tube – Modern Studio Equipment.
Amazon.com: Roll Bar Clamps 0.75 inch (3/4"),0.875 inch (7/8"),1 inch Tube Mounting Bracket Clamp, Aluminum Tube Clamps for Led light Bar Fog lamp ATV Whips Mount : Automotive