This is a specially drilled brass-plated hinge tailpiece, customized by C. B. Gitty for use with 4-string cigar box guitars. These make great low-cost tailpieces for CBGs, without requiring any potentially dangerous metal drilling. We include two matching mounting screws and a 2-page installation/usage guide showing you how to make use of these tailpieces. They are intended for use with ball-end guitar strings, though you could use loop-end if you ran the string back through the loop. These hinges are 1 3/8" wide by 2" total height. See the third photo for an installation example - note that the photo shows the 3-string variety of this tailpiece, but it gives you a good idea of how to use it. See our separate Amazon listing if you need the 3-string variety.