WD Music WD250S Mini Pot Split Shaft 250K A Taper<div style="text-align: left;"><strong>[Product Information]</strong><ul><li><span class="a-list-item"> 16 mm diameter </span></li><li><span class="a-list-item"> .75 pitch thread </span></li><li><span class="a-list-item"> 18 spline </span></li></ul></div><img src="http://ecx.images-amazon.com/images/I/51IIb%2BR71pL.jpg" noproxy>