Kluson Lightweight Aluminum Wraparound Stop Bar Gold W/Steel Studs - KLP-1126G The Kluson aluminum stop bar tailpiece is true to vintage specifications. Made from light-weight aluminum to increase string definition and resonance on those instruments using darker tone woods like mahogany, while reducing weight. Comes with studs only. Made in the USA Important Specs and Dimensions: Thread = 5/16 – 24 US Thread Stud to Stud Spacing = 3.22 in./ 82mm Tailpiece Material = Aluminum Stud Material = Brass Stud Cap Size = 13mm/.5in Tailpiece weight