The Polaris Dolly is all about being on the go. It is quick to set up and light enough to handle and carry it wherever you go. Designed for 1¼” - 2” speed rail/track and can extend to any length as per shooting needs; Adapts most Camera Heads via Mitchell mount,75/100mm bowl adapters Brake/Anti-Tilt Bracket keeps the dolly in place with added Safety & Reliability; ¼”-20, 3/8”-16 & 3/8" Holes for accessorizing setup with LED Lights, Monitors, etc. High-Density Track Wheels with SS bearings give Smooth, squeak free move on Straight/Curved Track; Compact, Easy Setup saves Valuable Production Time 100% Quality Assurance Guarantee; Buy With Confidence