I see a lot of posts about pipe sizes so I wanted to post what I found. I used drill bits to determine the dimensions. 1/4 inch pipe = 1/8 inch chisel 1/2 inch pipe = 17/64 inch chisel 3/4 inch pipe = 29/64 inch chisel Stretch to fit it close. 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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