I have these Grommets used to build H brackets for a 4x4 fence I drove them in with a battery powered screwdriver with the bit that came with these grommets The heads on these are the 1/4" x 6" heads of Spaxx, who were VERY quick and easy to carve, far superior. I had a strip but I was able to pull it out before it was completely destroyed. Even this conversion was a lot better than the 1/4". Also, these things fit snugly and feel really solid.
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