Springfield 1100009 Non-Locking 360° Seat Swivel - 6.75" Square with 0° Tilt, Stainless Steel

Full 360° rotation Standard four-hole mounting pattern Non-locking design 0-degree tilt Dimensions: 6-3/4" square x 1-1/8" heightYou may also like Springfield 1601002-L Locking Power Rise Sit Down Pedestal.