It's difficult to find accurate measurements on the hand size of Shaq. Fortunately, Shaq compared his hands with Kawhi Leonard on live TV whose hand size we know with certainty. His hands were quite bigger than Kawhi's. Shaq's hand length seems to be at most half an inch longer than Kawhi's. Their hand spans also look like they don't differ by more than three-quarters of an inch. By the way, Kawhi's hand size is 9.75 inches in length and 11.25 inches in span. It's therefore safe to say Shaq's hand length is in the range of 10-10.25 inches and his hand span in the range of 11.75-12.00 inches. You can find the video of them comparing hands in the link below.