The Benro DL08 tripod dolly allows your tripod to be mobile and is ideal for quickly repositioning your camera. Your foot can operate the wheel locks and they lock both wheel rotation and roll. The dolly folds up to 21 inches for easy storage and includes a carry handle. The diameter of the dolly is 33 inches when in use. The DL08 dolly is compatible with the following Benro tripod models: A573TBS7, A673TMMBS8, AD71FK5, BV6, BV8, and BV10.