The Sight-Rite Laser Boresighting system delivers unmatched accuracy every time. Precision machine caliber specific brass casings are equipped with a high-output laser to deliver accurate results saving time and money. Comes aligned; with LR41 lithium batteries. 
Precision machined brass casing for optimum accuracy
Caliber specific factory alignment
High output laser
Units include (3) three LR41 lithium batteries