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These are noticeably smaller than the normal strap buttons (for example, the ones that comes on my Fender Stratocaster). Besides the small size, they seem well made. If they are only a little larger, then I'd have less worries about strap accidentally slipping off them.
Way too shallow and narrow to be of use for a full size guitar. You can forget getting a strap lock or even a thicker strap on these tiny things. In their defense, they seem well made, and they had the correct diameter listed. I should learn how to read.