Fotodiox Pro Studio Solutions EZ Pro Softbox Speedring Insert for Calumet Genesis 200， 400， 300B Strobe Light<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"> All metal design inter-changeable speedring insert </span></li><li><span class="a-list-item"> Standard Speedring for Rectangular or Octagon box </span></li><li><span class="a-list-item"> Insert has a outer diameter of 5 7/8" </span></li><li><span class="a-list-item"> Smooth surface for effortless mount </span></li><li><span class="a-list-item"> 24 Month Manufacture Warranty </span></li></ul></div><img src="http://ecx.images-amazon.com/images/I/41LhFK3S%2B3L.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/413HGo72PqL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/411381pCsmL.jpg" noproxy>