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The product is great. Just a word of caution. Choose a drill bit that is just a tiny bit smaller than the screw. It's safest to drill a hole in a piece of scrap wood and try the screw in it. If you can pull the screw out, the hole is too big. If it goes in hard, try a slightly larger hole. It's also good to use an awl or other sharp object to start a hole before drilling so your drill does not wander, damaging your precious instrument. I have installed them on all 4 of my ukuleles without any problem. They work great.
I used these on an A style mandolin, but I think the size would also be OK for guitars. I was pleased with the appearance and they came with both washers and felt pads for a nice looking installation that doesn't mark the finish. The description includes the words "strap locks", but you can see from the picture that there is no kind of locking mechanism. However, the size of the mushrooms provided a nice snug fit for the strap I installed, and I think the fit is as good as any standard button. I was quite happy with them, and got 3 sets not much more than I had expected to pay for one.
These worked out great for my Alvarez 5014 guitar and a Cordoba Concert series ukulele. For the Uke I did exchanged the size of the screw because it was excessively long for the Uke heal. I also applied wax to the pre drilled holes to ease penetration. A stepping drilling is recommended to prevent splits and raising up the finish or wood layers on instruments assembled from laminate wood.
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.
I only needed a pair of these, so I used the brass ones. But the screw actually broke in half while I was installing it - into an already-threaded hole in the tail block. Glad I had more screws to use for backups. I advise pre-drilling your holes as large as possible.
Drilled a pilot hole a couple millimeters smaller than the shaft of the screw and zipped the screw right in with a power driver. Installed these flawlessly on the heel of the neck of three instruments in less than 15 minutes. Provided screws worked just fine.
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.