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2-pack of M6-1.0 socket head 18-8 stainless steel screws for mounting rings to dovetail bars.
M6-1.0 is similar in size to, but different from, the more standard 1/4-20 screw. Rings, saddles, etc, that use metric thread will likely use the M6-1.0 where a 1/4-20 doesn't quite fit.
Available in various lengths for your application.