Get meticulous accuracy with the most exacting tolerance specifications in the sighting industry.Sight-rite is sme's precision machined caliber specific sighter that delivers unparalleled results.It is precision machined from brass casing for optimum accuracy and has a high output laser.Included are three (3) button cell batteries.Type: Bore SighterCaliber: 308 WinStyle: LaserMaterial: BrassBattery: Alkaline