One Hole Rigid Pipe Strap 1/2″, Malleable Iron
https://nsiindustries.com/product/one-hole-rigid-pipe-strap-1-2-malleable-iron/
Bridgeport One Hole Rigid Pipe Straps are used to secure rigid conduit and intermediate metal conduit to a variety of mounting surfaces. Malleable iron construction offers the heaviest-duty solution with excellent impact resistance.