My lute guitar lacked a strap button so I ordered this set by Harley Benton.
After taking a first glance at them my impression was: 'Well, they could have done better'.
The buttons aren't polished, just raw milled and then electroplated.
Nonetheless: drill a hole, take a screwdriver and... don't use the screws shipped with the buttons, they seem to be a little weak and might break.
All in all, the strap button set is good when you just need working strap buttons.