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"10.25" square flat profile swivel plateMounting holes for mounting swivel to underside of chair measure 8" x 8". Holes are rectangular shaped measuring approximately 1/4" x 3/8"Swivel features full 360 degree rotation on 65 pre-lubricated 3/8" ball-bearings in a full round trackOverall height with installed glides is 1.75"Includes 12 pre-installed black glidesPopular on many brand name recliners and easy-chairs.Great for replacement use or new applicationsBlack powder-coat painted finish*** Note: The painted finish of the swivel plate is meant only as a protective finish and may have some scratching & marring from storage & handling. This is not meant as a visible finish as the part is normally hidden from view when installed.