Bridgeport 1908 3 IN Pipe Strap, Two Hole, Box of 20
https://nsiindustries.us.com/product/3-two-hole-rigid-steel-imc-pipe-strap/
Bridgeport Two Hole Pipe Straps make quick work of securing rigid conduit, intermediate metal conduit (IMC) and electrical metallic tubing (EMT) to a variety of mounting surfaces.