The 4PCS U groove wheels are ideal DIY gadgets for you to build the camera track system.
You can also replace the wheels on the dolly that use skate/skateboard wheels with a 8mm center bore.
This will allow you to use your dolly on any uneven surface.

Technical Details

Product Details

Package Dimensions
Width : 3.2 inch
Height : 1 inch
Length : 4.8 inch

Shipping Weight: 2.4 ounce (View shipping rates and policies)

ASIN : B010FDLSHU