I found. I used drill bits to determine the dimensions. 1/4" pipe = 1/8" chisel 1/2" pipe = 17/64" chisel 3/4" pipe = 29/64" chisel Stretch to fit. 1/2 inch is best for CAT5 or CAT6 cable. You can't get 3/4" through RJ45 unless you stretch it. However, a CAT5/6 cable with more heat will still shrink it, but that extra heat will also start to deform the cable shield.
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