I hardly bought them because one review said they were under 2" but were taped to keep them fits. The part that fits in the hole is spaced 1.992 inches (0.008 inches) apart and has latches on each side to hold it in place. I don't know how it could be more ideal for 2" holes. The overall diameter with the rib is 2.180 inches, leaving a 0.090 inch (3/32 inch) rib to cover the roughness of the hole being cut.