"How to protect your 7/8 holesaw from damage:"
To keep from breaking the 1/4" bit or the teeth on the 7/8" hole saw when drilling in a metal box, put a 1/4" x 1-1/4" fender washer over the center of the hole to be drilled, the hole saw teeth will hit the fender washer and spin. The fender washer can be removed, and the hole can be drilled. The fender washer keeps the teeth from grabbing into the metal of the box.
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