I got these brackets to mount 3 inch PVC pipe for a radon mitigation system, and the brackets worked great. I used a single 1/4 inch lag bolt to hold each bracket. As others have pointed out, the arms of the bracket block access to the center mounting hole making installation a bit tedious. What I did was place the bracket where I wanted it and inserted a drill bit (hand held) in the center mounting hole and used the tip of the bit to scratch a mark on the wall. I could then move the bracket aside and drill a hole at the mark. Using hex head lag bolts for mounting, I used a ratchet wrench with a 7/16 socket to tighten the lag bolt. Mounting the brackets that way was easy.I’m including a couple of photos showing a scrap of PVC pipe secured in a clamp.The package has an advisory note suggesting to place the brackets directly below a coupling or fitting in the pipe on vertical runs to keep the pipe from slipping down and that’s what I did. The brackets are well made and look good (as good as a bracket can look at least). One side of the bracket has two little plastic nibs (see photo) that I assume are to help pry the bracket open to release the pipe if necessary. You’ll want those nibs on the side opposite the coupling or fitting so that bracket sits flush. These served my purpose perfectly.