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This is a well-made
set of 12 nickel-plated 7/8" candle cup inserts/grommets. These are the same inserts I use on all of my acoustic/electric cigar box guitar builds.
Typically used to finish lathe turned wooden candlesticks, these have come to be a standard sound hole trim treatment in cigar box guitars. They give a finished look to any appropriately sized hole in various projects, and we have heard of them being used in foam and clay where the insert was pushed in and the center scooped out to make eyeballs, connection points, or pretty much anything you can think of.
The outer diameter of the insert is 1-3/16 inches, and the inner diameter is 7/8 of an inch. These are very snug and fit well in a 7/8-inch hole, but with a little glue to help hold it in place, should work in a hole size up to an inch or so.
Testing on a thicker composite as well as a thinner full wood cigar boxes both did well with a 7/8-inch hole. Very hard woods or thicker material may require a 29/32 of an inch hole. When things seem tight, a little sanding of the hole is often enough to create the necessary space. The portion of the insert that gets pushed in to the hole has three evenly spaced protrusions that help hold it in the hole and/or provide a surface for glue to grab onto when gluing in place.
We include a "How-to" sheet with details and tips on getting the best installation of your inserts.
A NOTE ON SHIPPING AND HANDLING:
We typically make two runs a day to the post office. Once at 12:00 PM (Noon) Central Time, and once at 3:30 PM Central time. So, while we give ourselves a one day handling period, orders often ship within hours of receipt. We pack in new quality recycled boxes that protect your purchase.