This is a great hole saw for an electrician as they don't need to carry a drill to have a real hole saw. The set screw cuts into a second hole and the chuck rotates freely. So if you don't have access to a welder to weld a chuck to a real hole saw, save your money. When soldered together they become absolutely cool. I can keep all 3 in my tool belt and just carry your punch. Would recommend if you know how to weld.
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