‧Standard Bolt Down Swivel Stool Base 28″ ‧OPTION A* 3 Prong swivel 360 Revolve for no back stool ‧OPTION B* Square swivel for stools with back has self returning swivel ‧Overall height 28″ ‧All base comes with 3” column ‧Standard color: Black,Chrome,Brushed Steel ‧Weight 15Lbs