Tufforce Red Laser Bore Sight for SHOT GUN 20 Guage, SL-B20R
-Tufforce Red Laser Bore Sight for SHOT GUN 20 Gauge, -Shell material: Aluminum 6061, silver color, -Laser wavelength :632--650 nm -sighting range : 10-100 yards; Laser Beam <5mw -Dot size : 1.5" @ 100 yds -3 batteries included, battery life over 2 hrs if continuous on