Our Golden Age Adjustable Wraparound Bridge is a modern reproduction of the first combo bridge/tailpiece to feature individually adjustable saddles. The wraparound design brought accurate intonation to Les Paul Junior®, SG Junior®and similar solidbody guitars, and has been popular since the 1970s. Two alignment screws adjust the overall intonation. The height-adjustable mounting studs include knurled bushings. The strings load from the front of the chorme-plated die-cast base, wrap over the back of the bridge, and over the notched saddles. Drill 7/16" (11mm) holes for the bushings. Measurements: String spread: 2-3/64" (51.82mm) Saddle radius: 12" (304.80mm) Stud spacing: 3-1/4" (82.55mm) Stud threads: M8 x 1.25mm About bridge & tailpiece measurements: String spread is the distance between the centers of the outer strings on a bridge or tailpiece. Saddle radius determines the arc formed by all the individual saddle heights, and is similar to the measurement of a fretboard. Stud/post spacing is the distance between the centers of the mounting posts of a bridge or 'stop' tailpiece. Tech Tip: Slotting Tune-o-matic style saddles Nut slotting files work great for metal saddles. Choose your file size as you would when slotting a nut: use the same gauge as the string, or a few thousandths larger. After filing to the desired depth, we suggest polishing the slot with abrasive cord to remove file marks and burrs.