Thomson QS 1/4 L 12， Quick Shaft， 0.2490 / 0.2495 in Diameter， Class L， Carbon Steel， 60 Rockwell C Min.， 12 in long</br></br><div style="text-align:left"><b>[Product Information]</b><br><ul><li>Class L shafting is designed for use with Super， Super Smart and XA Precision Ball Bushing Bearings</li><li>Available from stock and cut to length in most material types and options</li><li>Centerless ground for an industry leading cataloged surface finish of 8 Ra max</li><li>Roundness within 0.000080"</li><li>Straight within 0.001" per foot cumulative when shipped from the factory</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/41UWC1xzjlL.jpg' noproxy></br>