Fits just behind the bead sight on the barrel.
Much easier to 'pick up' front sight bead
Snaps on, no tools required.
Excellent addition to any 12 or 20-gauge shotgun
Easy to see in daylight and low light conditions
Improves your shooting
Does not work with ventilated barrels
Measures: 0.7"H x 0.87"W x 2.1" L
Weighs: 0.2 ounces