This barstool frame also works on round seats with backs. The metal frame comes in two heights. The 30″ barstool frame is about 25″ tall and meant to be used with a 1″ swivel and a 4″ seat to make a 30″ bar stool. The 24″ barstool frame is about 19″ tall before you add a 4″ seat and a 1″ swivel. Each frame will ship with glides (not pictured) and a standard flat swivel. A 3 degree pitch swivel is available for bucket seats. Our frames are built for every day commercial use.