National Hardware N100-345 (V4230) 1/4-in Cable Clamp in Stainless Steel in the Chain Accessories department at Lowes.com
Small Cable Clamp – Fosco Connect
Fit for 4-5mm Simplex Single Wire Rope Clip Cable Clamp Grips Stainless Steel M6 | eBay
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
1/4 in. Small EZ-Cable Clips - White Aluminum (15-Pack) PAW-1525L1 - The Home Depot