Boston string retainer id: 16841 sku: SH-3-G brandname: Boston Details string retainer, button model, with screw, diameter 10mm, height 5mm, gold Related products SH-3-N Boston string retainer string retainers and ferrules SH-3-C Boston string retainer string retainers and ferrules SH-3-B Boston string retainer string retainers and ferrules