Features: brand new and high quality Parameters: Class IIIA, less than 5mW red laser. Application: The laser bore sight is suitable for 38SPL boresighter, caliber specific. 3 Sets Batteries: 3 sets (6 total) upgraded batteries. Each set lasts up to an hour. Please remove the batteries after use. High Accuracy: Fastest gun zeroing and sighting system and save you for time and cartridges. Design: Sturdy and durable brass construction, light and compact, and easy to sit perfectly in the bore. Specifications: Material: H59 Copper Color: Golden Package Weight: approx.30g Size: approx.37.4x9.6mm/1.47x0.38in Package Includes: 1Pc x Laser Boresighter note: Please allow 1-3mm error due to manual measurement. pls make sure you do not mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you!