Welcome to the Ford Mustang forum built for owners of the Mustang GT350, BOSS 302, GT500, and all other S550, S197, SN95, Fox Body and older Mustangs set up for open track days, road racing, and/or autocross. Join our forum, interact with others, share your build, and help us strengthen this community!
The more important part is the drill. Drilling a 3" diameter hole in steel is fairly demanding so having a hand drill with good torque that can keep cool at low RPM's is most important. I burned up my dewalt drill that had a max speed of 2700RPM doing my first hole. It didn't have enough cooling at 2-300RPM, nor the torque. Bought a milwaukee with a max speed of 850RPM and that ate right through without issue.
Their strut opening tools are great! I purchased one for the S550, and the shop that installed the new springs, and camber plates liked it so much they purchased it from me for what I paid Vorshlag originally!