Lazy Susan Turntable Bearing, 4 InchProduct Description:Double 4 Inch Square Galvanized Steel Plates, Separated by a Plethora of Steel Ball BearingsBolt Between Two Objects for RotationLike That Spinning Center Section at a Restaurant TableSmall, but Mighty, 4 Inch Lazy Susan Bearing Boasts a Balanced Load Capacity of 300 PoundsInside Hole Diameter is About 2-1/16 Inch; Their Open Center Allows Access for Cables or Shafts.These Low Profile Bearings are Only 5/16 InchThickMounting Holes on the Corners are 1/8 InchTriangle