I have been very disappointed with most of the mounts I buy live (online), but they seem to be of good quality. They have the typical grade 8 yellow zinc finish. None of these broke when installed with my cordless percussion gun. I only installed them in March 2020 but will report if they rust excessively in the future. The thread pitch was also not listed in the description. They are sized m6x1.0 - a common Japanese size for a 10mm socket head cap screw.
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