Orion 9863 11 Pound Counterweight for Atlas and Sirius Mounts<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"> Extra 11-pound counterweight designed for the Orion Atlas EQ-G and Sirius EQ-G GoTo equatorial mounts </span></li><li><span class="a-list-item"> Helps balance especially heavy telescopes and instruments on the Atlas EQ-G or Sirius EQ-G equatorial mounts </span></li><li><span class="a-list-item"> Ideal for balancing heavy astrophotography gear </span></li><li><span class="a-list-item"> Features a nylon-tipped， tri-lobe lock knob for easy grip - even while wearing gloves in the field! </span></li></ul></div><img src="http://ecx.images-amazon.com/images/I/41VjwHYmb1L.jpg" noproxy>