The Tiger Rock Inc. LBS308 .243/.308 Cartridge Laser Bore Sighter is designed for shooters who demand precision and reliability. This high-quality tool is essential for making accurate sight adjustments with its superior engineering. Constructed from durable aluminum with a brass casing, it provides a snug fit in your chamber. The visible red laser, with wavelengths of 635-655 nm, operates effectively out to 30 yards, helping improve your shooting accuracy. Fits .243/.308 Chambers Brass casing LED Type: Visible red laser Laser wavelength: 635-655 nm Laser beam: < 5mW Sighting range: 20-30 yards Dot size: 1.5" @ 100 yards Requires (3) LR41 button cell batteries This compact bore sighter is a must-have for any shooting enthusiast.