The Valley Carburetor Adjusting Tool, item #ATCA-5, is a specialized hand tool designed specifically for adjusting carburetors on GMC and Chrysler vehicles. With the manufacturer part number ATCA-5, this tool ensures precise and accurate adjustments for optimal engine performance. Perfect for automotivists and mechanics looking to fine-tune their vehicles’ carburetors, this tool is a valuable addition to any collection of automotive hand tools. Some of these are opened due to long time storage. They are new old stock. Please refer to photos before purchase.