Designed for restoring old rocking chairs or for building a new one. This swivel returns rotates 360 degrees. Measures 8 1/4" x 9 3/8" x 3 thick - Mounting holes are rectangular shaped and measure approximately 7 x 23mm, the distance between mounting holes are 5.5"x6.25" Rocking mechanism built with 3 heavy duty springs Mounting holes on both top and bottom make for easy installation. Made in the U.S.A