Approximately 27x5x9mm striped sterling silver donut bails, 20mm inner diameter. Measurements are based on closed dimensions and include top loops. JBB Findings is internationally known as a manufacturer of quality silver bails. Fits most 35mm to 40mm gemstone donuts. Loops fit 2mm (or slightly larger) chain or cord. Squeeze the bail gently to align the loops after inserting donut. Please handle with care - these bails are not designed to be opened and closed repeatedly.