The JONES STEPHENS Plumbfit Water Closet Flange is designed to fit inside 3 in. The flange is extra thick and has short slots for increased strength. It has 6 screw holes and a long shank. 7 in. Long shank with 6 screw holes For water closet (toilet) applications Extra-thick flange with short slots for increased strength Cut pipe 1/8 in. below floor and remove concrete so unit will fit flush PVC construction Will not rust or corrode With knockout For commercial and residential applications 2-1/8 in.