The Super Max Speculum 7 inch maximum lateral spread A custom made three blade speculum, to our knowledge the widest spread available. The two lateral blades are spread and held apart by inward pressure. This sets up a binding action with the rods that holds the blades apart. The third blade is pulled down and held in place by a wing nut. Lateral movement of this blade is prevented by guide pins near the wing nut. The third blade is totally removable. It should go without saying that this speculum is for people who are both knowledgeable and dealing with fairly "open" holes.