The diameter of the steel tube hole is 1".
Heavy Duty: Weighs 8.8 lbs. for stability and support during use. Foam + synthetic Leather rollers: provide support and comfort for the thighs, making workouts safe and comfortable.
Adjustable: Multiple adjustment positions to meet the correct and preferred height of the user.
Convenient: quick installation in just 2 steps when in use and can be taken off when not in use to save space in use.