One Hole AC/MC Strap 14/3 12/3, Zinc Plated Steel
https://nsiindustries.com/product/one-hole-ac-mc-strap-14-3-12-3-zinc-plated-steel/
Bridgeport One Hole AC/MC Straps are used for securing AC/MC cable or flexible metal conduit to a variety of mounting surfaces. Made from zinc plated steel, these straps are dependable and resistant to corrosion.