Hillman 2-Pack to 1-in dia Steel Suspension Clamp in the Pipe Support & Clamps department at Lowes.com
The Plumber's Choice 1-1/2 in. Steel Cable Clamp; Hangs Tubing, Wiring, Ropes, for PEX, Plumbing, Marine, Automobile; Galvanized 112CPSWG - The Home Depot
Fig. 216 Heavy Duty Two Bolt Pipe Clamp - Empire Industries
Metal Clamps according to DIN 3567 Form A | STAUFF