Davidson Action Wrenches are designed for the switch barrel shooter with a custom built rifle. Manufactured from 7075-T6 aluminum, these tools are not designed to remove factory installed barrels. Action wrenches are used to break the action free from the barrel while the barrel is held in a barrel vise. This allows the shooter to change barrels in a matter of a few minutes. All rear action wrenches are inserted through the rear of the action and have a 3/4 inch hex end which requires a wrench for turning. Port wrenches are inserted through the action port and are turned by hand. Barrel Vise available separately. Mfg: Davidson