KAMERAR SD-1 23" DSLR CAMERA SLIDER DOLLY TRACK VIDEO STABILIZER SYSTEM W/ WHEEL 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. The width of the axles are 7" from wheel to wheel. The wheels use high end roller bearings with smooth (roller blade type) rubber wheels. This listing includes: (1) Slider Dolly SD-1,Lifetime Limited Hardware Warranty. For more information please check in http://kamerar.com/pages/about-us Checkout Cheesycam Video Review: https://www.youtube.com/watch?v=dq2Y1wR4YMg.Lifetime Limited Hardware Warranty. For more information please refer to Kamerar website