PROAIM Fusion Compact Portable Slider Dolly integrates the latest technology with supreme quality to maximize your creative potential The head mount is designed with a 100 mm bow & offers additional receptacles of 75 mm conversion ring, 150mm Bowl & a Mitchell Mount It has solid V-Shape wheels designed with double ball bearings to run smoothly on tracks & a flat surface The soft-grip rubber ball feet, support bracket, and safety wheels give overall secure, leveled & greater performance Includes Storage Bag; 100% customer satisfaction guarantee; Buy with confidence