One Hole EMT Pipe Strap 1/2″, Zinc Plated Steel
https://dev.nsiindustries.com/product/one-hole-emt-pipe-strap-1-2-zinc-plated-steel/
Bridgeport One Hole EMT Pipe Straps are used to secure electrical metallic tubing (EMT) to a variety of mounting surfaces. Zinc Plated Steel construction offers a tough, corrosion resistant mounting solution in harsh environments.