CowboyStudio Triangle Dolly Kit Table Skater 3 Wheel Camera Truck For DSLR Camera Video Head screw accepts 1/4-Inch and 3/8-Inch female heads Every wheel can reach 180 degree rotation The length between the wheel and the center of platform: 14cm/5.5-Inch(approx) The length between two wheels: 24cm/9.4inch(approx) Excellent straight and curved movement ability