Pit Bull CHIJS70031 Adjustable Mechanic Seat The seat is approx. 11.5 inches in diameter and swivels 360 degrees Includes 5 smooth rolling swivel casters which are approx. 2-1/4" in diameter and 5/8" wide The tool tray measures approx. 15 inches in diameter and provides amble room for all needed tools The height adjust from 15 inches to 19 inches weight limit is 300lbs Work in comfort thanks to the over 1.5" thick cushioned seat