Increase your accuracy, align your red dot and lasers. To be used with the Bushnell laser boresighter .22-.50 CALIBER (Model: 740100C), or similar laser boresighters. The arbor screw hole is exactly in the center of an HP68 projectile.
Once attached, the whole laser boresighter and arbor goes inside your barrel. The laser shows you where your barrel is pointing so you can align your accessories.