National Hardware N100-345 (V4230) 1/4-in Cable Clamp in Stainless Steel in the Chain Accessories department at Lowes.com
The Plumber's Choice 3/4 in. Steel Cable Clamp; Hangs Tubing, Wiring, Ropes, for PEX, Plumbing, Marine, Automobile; Galvanized 34CPSWG - The Home Depot
Panel Support Clamp for 1.5mm Stainless Cables | Hang 1/4” thick panels
The Plumber's Choice 1-1/4 in. Steel Cable Clamp; Hangs Tubing, Wiring, Ropes, for PEX, Plumbing, Marine, Automobile; Galvanized 114CPSWG - The Home Depot