The Dolica LT-D100 professional basic tripod dolly is an excellent accessory for your tripod. Its primarily used for moving your tripod smoothly without to having to pick it up. Its compatible with tripods, light stands, and background stands. The Dolica Professional Tripod Dolly uses professional grade wheels with metal wheel bearings and 3" non-marring wheels. It has an upgraded one step down wheel lock that locks into place when you step on the lock knob. Its also integrates nice leg locks that travel along the dolly frame to adjust to various tripod sizes. Finally the Dolica Professional Tripod dolly collapses convenient into a small footprint and stores in a nice nylon case.