Spec Sheet Blog Item Code: DDHTDCF (Duro Dyne TDC Corner Crimp Tool #21072) This tool is an alternative to a Tinner’s Hammer when fabricating TDC ductwork. TDC and TDF Corners are secured by seating the corner inside the flange and then hammering or crimping the TD Flange over itself to hold down the TDC Corner. Note: this tool will not insert the Corner.
