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Diameterï¼ About 39 cm or 15.4 inches. With a free soft rubber Car Seat Belt Auxiliary Handle, which may also help any seniors or arthritis suffers to grab the safety belt while seated.NOTE:1. Not recommended for leather seats because of sharp-edge may hurt the leather surface EXCEPT you have another anti-slip protector/cushionï¼Available from other sellers on Amazonï¼.2. Not workable in case of high contoured bucket seats like racing car, or less than about 15X15 inches flat surface on your seat because of the diameter is about 15.4 Inches.3. Unable to rotating/turning on any soft or unflat surfaces. Q&A:What is the usable weight limited?For your reference only. The Max. Weight limit is 150 kg according to the data from manufacturer, however, for the better performance, the recommended weight is below 90 kg usually. Indeed, more weight and more likelihood of turning problem, but please do note that the weight is NOT the key factor to impact the turning function, compared with the factor of FLATNESS. In other words. more flat and unsoft on the surface of your seats, and more higher weight limit in any rates. In most cases, a hollow or uneven surface is the major reason of problems other than weight, because more weight is just likely to make a hollow or nest easily on your seat which leads to problems. For example, the weight limit on a flat wooden bench/chair should be much higher than that on a soft and caved seats. A 60 kg person may have problem on a soft and uneven seat and it may be workable perfectly on a solid and relatively flat surface.for a 100 kg person. Therefore, if you make seat relatively flat as possoble as you can by putting a folded towel or any other similar items and make sure it is still relatively flat and no hollow AFTER you seated no matter how weight you are in normal circumstance, then most of turning problem should be evitable based on our past experiences.