Everbilt 1/2 - 1-1/4 in. Stainless Steel Hose Clamp 6712595 - The Home Depot
Amazon.com: AKIHISA 2 PCS 2 Inch Heavy Duty Rigid Handleless Flat Pipe Bracket Clamp,Stainless Steel_304 Split Ring Hanger ID Range 48-51mm : Industrial & Scientific
Source High Quality Round Bar Clamp/metal Pipe Clamp/flat