Traditional archers and bowhunters, here's a key component for building or refletching your arrows. These are brass arrow inserts, sold in a pack of one dozen (12 pieces). They're brand new, never used, and come in their original packaging. The internal diameter (or shaft ID they fit) is .2445 inches – so make sure this matches your arrow shaft's inside diameter! Each insert weighs 50 grains, which is important for calculating your arrow's total weight (front of center balance) and spine. They're made of brass, which is durable and provides good weight up front for penetration. The brand is unbranded/generic. MPN does not apply. UPC does not apply. You glue these inserts into the front of your carbon, aluminum, or wood arrow shafts, and then you screw your arrow points (broadheads or field points) into them. Essential for anyone who makes their own arrows or does their own maintenance. Getting the right weight and fit is crucial for accurate, consistent shooting. A pack of 12 lets you do a full set of arrows with some spares. A fundamental supply for the serious traditional shooter or hobbyist fletcher.