Check the listing for details. 100 Grain Arrow Insert with Copper Base for 6.2mm/0.244" Arrow, 4 Pack & Brass. Condition: New. Listed at 11.32 USD. Features: The arrow weight brass base is made of wear-resistant and corrosion-resistant brass. The threads precisely match the arrow shaft's inner diameter and the arrow point thread. Archers can choose different weights of brass bases to precisely adjust the overall center of gravity of the arrow. In addition, it protects the arrow shaft, effectively dispersing impact force during repeated shooting, reducing the risk of shaft breakage or damage, thus extending the life of expensive arrow shafts. Relevant Usage: The arrow point internal external and threaded bolt brass base is suitable for traditional bows, compound bows, etc., meeting their needs for precise arrow control and adjustment. This adjustment improves accuracy, flight trajectory, penetration, and wind resistance in long-range shooting.