3pc. Chrome "Indie Bridges" - 1-string Hard-tail Bridges for Cigar Box Guitars & More

Basically these get used like any bottom-loading electric guitar bridge (like those on telecasters and such). You screw it to the top of the instrument, and the strings come up through holes in the instrument body (usually with a ferrule of some sort on the back to hold the string ball), and then up and over the individual string saddles. The saddles can be adjusted by means of a screw at the back of the bridge to get the intonation just right, and small set screws at the front of each saddle let you set the string action height. Overall it is fairly straightforward.