The hole saw arrived on time and allowed me to finish the job of cutting 4 easy holes in the new drop panel ceiling. The panels were thicker and harder than standard ceiling panels (not as hard as thick drywall, but close). The hole saw cut 4 very clean holes. saw assembly. Attach one of the three included drill bits to the main body using the included hex wrench. Good thing there are 3 drills in the kit. Then screw the hole saw to the bit holder (main body). When the hole saw is almost fully tightened, line up the holes in the hole saw with the two pins on the bit holder and screw in the ring to insert the pins into the holes. Nothing with it. My hole saw was a little loose when everything was assembled. But I could tighten it up by adding a thin washer between the bit holder and the hole saw. You will need to use a drill with a 1/2" chuck and run it backwards to cleanly cut the hole without cracking. I wanted to run it backwards and then run it forward to cut a hole. started drilling in the opposite direction during the "hole". He quickly cut a very nice, clean hole by working backwards. I'll probably never need it again, but it was worth it considering the amount of time saved cutting holes any other way.