HiViz Two-In-One Magnetic Base Rib Shotgun Sight Model 350 Wide Green/Orange. 171" to .440" (11/64" - 7/16"; 4.2mm - 11.1mm). This Night Sight from HiViz includes two fiber optic family LitePipes one round orange and green LitePipe and one triangular orange and green LitePipe Specifications for HiViz Two-In-One Magnetic Base Rib Shotgun Sight: Manufacturer: HiViz Gun Model: Universal Color: Reversible Green and Orange 2 Orange/Green Fabric/Material: Metal Beam Color: Reversible Green and Orange 2 Finish: Matte Features of HiViz Two-In-One Magnetic Base Rib Shotgun Sight: Hi-Viz Two in One sight Fits 7/32" to 21/64" size vent ribs Fits narrow vent ribs Shoot better with better sights Easy to install with magnets Kit includes two reversible sights in red/green and round/triangular made in specialized factories Package Contents: Hiviz Two-In-One Magnetic Base Rib Shotgun Sight What firearm models does the manufacturer say HiViz Two-In-One Magnetic Base Rib Shotgun Sight is compatible with? The manufacturer says that HiViz Two-In-One Magnetic Base Rib Shotgun Sight is compatible with UniversalHIVIZ Two-In-One Magnetic Shotgun Sight with Reversible Green Orange LitePipe. Fits shotguns with ribs from .330 to .355 (21/64 to 23/64) (8.4mm to 9mm). Includes one round and one triangular replaceable Green and Orange reversible LitePipes.