This Tri-Wheel Dolly can be used for numerous material handling applications. It has a 9" diameter (11" if all wheels are pointed out) & 2" hard rubber wheels. The circular center measures 5" at the top tapering down to 3-3/16" at the bottom and is 2" deep. Under clearance is 5/8" from the floor. The over all height if something were to be places on top is 3". It is rated for 375 lbs.