Haoge 4PCS U Groove Wheels for DIY Camera Dolly Rig Slider Rail Track Table Skater<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"> The 4PCS U groove wheels are ideal DIY gadgets for you to build the camera track system. </span></li><li><span class="a-list-item"> You can also replace the wheels on the dolly that use skate/skateboard wheels with a 8mm center bore. </span></li><li><span class="a-list-item"> This will allow you to use your dolly on any uneven surface. </span></li></ul></div><img src="http://ecx.images-amazon.com/images/I/41xR2tcMpXL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/31QynQvGBIL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/418UkZY7VXL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/41ulp5eAawL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/417PyMdMVZL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/41fBxQBRE7L.jpg" noproxy>