HIVIZ Model 350 Two-In-One Magnetic Base Rib Shotgun Sight Fits: ribs from .330 to .355 (21/64 - 23/64 8.4mm - 9mm) Fits: Mossberg 500, 835, 930 and 935, Winchester 1300 Color: green and orange Magnetic base sight Includes two LitePipes (orange and green round, orange and green triangle) Fits ribs from .330" to .355" (21/64" - 23/64"; 8.4mm - 9mm) Model TO350 1 Year manufacturers warranty