Uses a 2 3/8" bit. The socket fitted perfectly. In fact it could have been slightly smaller for a tighter fit. Pulling on the cable pulls the sleeve with it; however in my experience that is typical of a grommet with a mouse hole. The actual device is stiff enough to hold the cable ends so they don't fall through the hole, which is exactly what I wanted. Nothing is more annoying than trying to grab onto something with one hand hold on to while the cord snakes back into the decrepit subfloor of your desk.
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