The Universal Center Ring is designed for use with either 2" or 3" shower drains, square drain risers and most other speciality shower drains. It comes with a 2" or 3" threaded snap-in insert to match the threaded riser portion of the drain. The Universal Center Ring has 24 Standard Float Sticks attachment slots placed every 15°, a 6" upper inside diameter and is 1-3/8" high. It is recommended that extra Standard Float Sticks (No. XFS-101-2) be used because the Center Ring which is included in the Quick Pitch Standard Kit is not needed when using the Universal Center Ring.