Forney 20990 Bottom Tap Industrial Pro HSS UNC， 3/8-Inch-by-16</br></br><div style="text-align:left"><b>[Product Information]</b><br><ul><li>Unified National Coarse (UNC)</li><li>High speed steel (HSS)</li><li>Includes 30-degree chamfer angle</li><li>Approximately 2 pitches chamfered and 1-1/2 tooth height</li><li>Used when threads need to go to the bottom of hole</li></ul></div></br></br></br></br></br></br></br></br></br></br></br></br></br></br></br></br></br></br></br></br><img src='http://ecx.images-amazon.com/images/I/21hgnrER1wL.jpg' noproxy></br><img src='http://ecx.images-amazon.com/images/I/31ZrsiDv9tL.jpg' noproxy></br><img src='http://ecx.images-amazon.com/images/I/31-e03vKMJL.jpg' noproxy></br>