Kamerar SD-1 DSLR DV Camera Track Dolly Slider Video Stabilization System (Black/Red) The total length of the Slider Dolly SD-1 is 24" inches which will allow the carrier platform approximately 15" of linear slide in between both axles. Smooth Slides up to 5 lbs. Four 1/4" Threads for Friction Arm. Adjustable Feet for Leveling. The wheels use high end roller bearings with smooth (roller blade type) rubber wheels. The width of the axles are 7" from wheel to wheel. Use on a tripod or on a flat surface with included feet.