The ServoCity V-Guide Lead Screw Dolly Kit is built specifically with V-Guide in mind. Four V-Groove Bearings get mounted on each side of the aluminum plates, and are properly spaced so that they align with V-Guide mounted inside of 1120 Series U-Channel. These bearings play the role of supporting the load, allowing the lead screw nut inside the dolly to create the linear motion without having to support the load. The lead screw nut has an 8mm lead which is compatible with any of the 3501 Series 8mm Lead Screws. Threaded holes on the tops of the Aluminum Angle Mounts make attaching channel and other components a breeze.