Exactly as advertised 2" hole saw and I measured and used a 2" hole saw with no problems Part fits perfectly in a 2" " Hole. Perfect as a very inexpensive desktop hub for my computer and data cables. a good 1/4 inch hole. Even if you're not sure about your 2" hole, it won't hit unless you cut a 2-1/2" hole. The top insert that snaps into the shell is in two parts. The bottom has three different sized slots if you want to be really picky with your cables. The top rotates to allow you to choose one of the three holes and helps fill in gaps if you use a slightly larger bottom gap than you need cord a little but pops out easily enough to replace the arrangement cord.
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