Oatey 43585 Flange Nuts, 3-Inch, White For use in hub-end of fitting Fits on inside of fitting Eight countersunk holes and two closet bolt slots for secure attachment to the floor Corrosion Resistant Stainless Steel Ring Meets ASTM D2661 & D2665, Listed with U.P.C. Test cap holds 30 ft head pressure test Adjustable ring for alignment of bolts and screws sits flush on floor 8 Screw holes for more secure floor mounting