Get meticulous accuracy with the most exacting tolerance specifications in the sighting industry. From the very smallest to the largest casing, Shooting Made Easys precision-machined, caliber-specific sighters deliver unparalleled results every single time.Features :Precision machined brass casing for optimum accuracyCaliber specific factory alignmentHigh output laserUnits include (3) three Alkaline button cell batteries (varies by caliber)