CU-5 Curling Die
          The CU-5 curling die set forms a complete off-center curl in three operations 
			  or an on-center curl in four opearions. To maintain the diameter 
			  of the curl the part should be closed over a mandrel in the third 
			  operation 
			  When forming heavier materials, a leader can be added to the 
			  backside of the punch which keeps the punch and die from 
			  spreading.