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I've just drilled a 28mm hole through a sleeper to put through a water irrigation pipe. Now I would like to somehow make it tidy and hopefully also prevent the edges of the hole. I was thinking a small square metal plate, with a 28mm hole that i could just screw on top of drilled hole on both sides of the sleeper, could do the job. Any thoughts if such a fitting exists, what is it called and where to find it? Any other ways to achieve the same outcome?

KMLN
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    "prevent the edges of the hole." What do you want to prevent the edges of the hole from doing? – Triplefault Nov 14 '23 at 17:20
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    Your question isn't clear. A sleeper, by definition, doesn't have spans and shouldn't need reinforcement. Please revise to describe the problem better and/or show us a photo. – isherwood Nov 14 '23 at 17:26
  • `drilled a 28mm hole through a sleeper` ... it would make more sense to say what material you drilled – jsotola Nov 14 '23 at 18:53

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If you are looking to prevent abrasion of the irrigation pipe on the rough edges of the drilled hole, try looking for a grommet or a bushing:

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Jimmy Fix-it
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  • Alternatively, you could just use a round rasp/file (some call it a "rat-tail" file) to smooth/debur and round off the edges of the hole(s). – Jimmy Fix-it Nov 14 '23 at 17:52