About this item Made in the USA – High quality, strong, & reliable bar stool swivel plate w/ return to center feature – Great for replacement use on many stools, bar stools, & chairs Mounting holes are 0.75″ long oval shaped slots & accomodate most 5.25″, 5.5″, & 5.75″ square mounting screw hole patterns (Mounting hardware not included) Auto spring return to center feature w/ rubber coated spring stops 200 degree rotation (100 degrees in either direction) on 43 pre-lubricated ball-bearings – 7″ Square top & bottom plates ** The top of the center bolt extends approximately 1/4″ above the top plate (see picture) – Please ensure that your seat allows for this in the mounted position See more product details