The Acratech Leveling base is a low-profile device with a secure ball head mechanism and a big, easy to read bubble level. Rated to hold up to 11kg; fits any tripod legs with a 3/8″ or 1/4″ thread and accommodates any 3/8″ threaded tripod head with a base diameter of 60mm or less (any widerencroaches onthe bubble level.) In excellent condition, with minor cosmetic wear.