tr>
<tr>
<td>1/2</td>
<td>0.3933</td>
<td>12</td>
<td>0.0833</td>
<td>Letter Drill Z (10.5&#160;mm)</td>
</tr>
<tr>
<td>9/16</td>
<td>0.4558</td>
<td>12</td>
<td>0.0833</td>
<td>12.1&#160;mm (0.4764&#160;in)</td>
</tr>
<tr>
<td>5/8</td>
<td>0.5086</td>
<td>11</td>
<td>0.0909</td>
<td>13.5&#160;mm (0.5315&#160;in)</td>
</tr>
<tr>
<td>11/16</td>
<td>0.5711</td>
<td>11</td>
<td>0.0909</td>
<td>15&#160;mm (0.5906&#160;in)</td>
</tr>
<tr>
<td>3/4</td>
<td>0.6219</td>
<td>10</td>
<td>0.1</td>
<td>16.27&#160;mm (0