Material: Stainless Steel<br /><br />Size:6mm in width，17-21mm in diameter.<br /><br />Color: Red，Black，White<br /><br />Package included:1 PC<br /><br />size detials( mm)<br />American  Size6   <br />diameter 16.5mm   <br />perimeter 52mm<br /><br />American  Size7   <br />diameter 17.3mm   <br />perimeter 54mm<br /><br />American  Size8   <br />diameter 18.2mm   <br />perimeter 57mm<br /><br />American  Size9   <br />diameter 19mm   <br />perimeter 60mm<br /><br />American  Size10   <br />diameter 19.8mm   <br />perimeter 62mm<br /><br />American  size11   <br />diameter 20.7mm   <br />perimeter 66mm<br /><br />American  size12   <br />diameter 21.5mm   <br />perimeter 70mm