If your fab shop cuts a lot of small holes, this attachment for a Victor cutting torch will save a lot of time. All you do is screw off the tip nut and screw on this attachment. Nothing to change or fall off. I use a ball bearing pressed into a steel housing that protects the bearing from the heat. No drag while turning. It is adjustable for holes 1 1/2" to 10" diameter.Click image for larger version. 

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