chairpartsonline 25.5″ Replacement Ring Base w/Swivel for Recliner Chairs & Furniture, Includes Swivel – S5471
25.5" wide ring base made of 3/4" high test steel tube ring w/ four welded rectangular steel cross bars measuring 1" x 1/2" and 8 pre-installed glides
10.25" square flat profile swivel plate w/ 65 3/8" Ball Bearings
Mounting holes for mounting swivel to underside of chair measure 8" x 8". Holes are rectangular shaped measuring approximately 1/4" x 3/8"