chairpartsonline 7- Inch Replacement Memory Spring Auto Return Bar Stool Swivel 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