Designed to give the shooter more muzzle control and a smoother "swing-through" when taking the gun to the target or when better gun balance is needed. Counter weights also help keep the muzzle down during the firing. Easy to install, the Graco Universal Barrel Weight Kit includes a barrel clamp and three different weights to choose from. Choose from 2 oz or 3 oz weights that are polished and blue steel. The clamp is lined with a non-slip tape to protect the barrel. Also included are two adapters to fit the unit to 20 gauge, 28 gauge and .410 gauge barrels.