The Hang Em' Fast joist hanger tool sets your 2x joist hangers perfectly every time. This tool is designed with efficiency and ease of use in mind for accurate joist hanger installation. Just slide your hanger into the tool, line the tool up with your mark while the bottom lip of the tool is flush with the ledger board and nail your hanger in. This tool is compatible for use with 2x4, 2x6, 2x8, 2x10 and 2x12 hangers.