The Remington ETA Sight (Easy Target Acquisition) is designed specifically to fit the Remington 870, 11-87, and 1100 models with 9/32 rib. Includes interchangeable Litepipes in red and green white both round and triangle. easily install by clipping onto the rib just behind the factory bead. Fits all Remington shotguns with 9/32 wide rib. Round and Triangular LitePipe Shapes.