HiViz magnetic base shotgun sight fits ribs from .171" to .440" (11/64" - 7/16"; 4.2mm - 11.1mm). It includes two fiber optic family LitePipes, one round, orange and green LitePipe and one triangular orange and green LitePipe. Gun Models: Remington: Versa Max; Beretta: 686 & 687 models with ultra narrow rib, AL390, A304, AL390 Field, 391Urika Field, A400 Xplor; Browning: Gold Series, 28 ga. and .410 Citori; Sigarms: SA-3 Hunter, SA-5 Upland; Benelli: 20 gauge. All HiViz products are covered against defects in materials and workmanship for a full year. The Two In One is a magnetic shotgun sight with a new twist – one sight with two colors. Our unique molded LitePipe design makes it possible for us to combine two colors in the same sight. Changing colors is now as easy as turning the sight around 180°. The Two In One has several other benefits. Each sight has four magnets in the base making this our strongest magnetic sight. The LitePipes are protected by a housing making them nearly impossible to break and we're including them in two different shapes – round and triangular. Select the shape you want plus the color combination (orange or green) on the same sight. Comes in four sizes to fit rib widths ranging from just under ¼ inch to 7/16 of an inch.