Oatey® Level Fit Closet Flange Plastic Ring with Long Mounting Slots have four countersunk holes for secure attachment to the floor.
Oatey® 3" or 4" ABS closet flange w/plastic ring, long mounting slots – w/o test cap
Oatey® 3" or 4" PVC closet flange w/plastic ring, long mounting slots – w/o test cap