Panavise 851-00 Knuckle Adjustable Knob and Screw (Black)<div style="text-align: left;"><strong>[Product Information]</strong><ul><li id="replacementPartsFitmentBullet" class="aok-hidden" data-doesntfitmessage="We're not sure this item fits your " data-fitsmessage="This fits your "><span class="a-list-item"><span id="replacementPartsFitmentBulletInner"><a href="#" class="a-link-normal hsx-rpp-fitment-focus">Enter your model number</a>to make sure this fits.</span></span></li><li><span class="a-list-item"> Shaft screws into the adjusting knuckle. For an ultra low-profile mount， screw directly to one of our Mounting Bases! </span></li><li><span class="a-list-item"> Quality manufactured and fully adjustable: 210-degrees Tilt， 360-degrees Turn &amp; 360-degrees Rotation </span></li><li><span class="a-list-item"> Knob and tamper-resistant set-screw adjusting options included </span></li><li><span class="a-list-item"> Overall knuckle height approximately 2.5-Inch (63.5mm) </span></li><li><span class="a-list-item"> 0.25-Inch 20 mounting stud with lockring </span></li></ul></div><img src="http://ecx.images-amazon.com/images/I/41BgMAc26WL.jpg" noproxy>