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
National Hardware N100-345 (V4230) 1/4-in Cable Clamp in Stainless Steel in the Chain Accessories department at Lowes.com
1.5mm Cable Suspension Set with Ceiling/Top Fixing and Panel Clamp