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Drill America DWTH212-13812LH 1-3/8"-12 2-1/2" OD HSS Left Hand Round Adjustable Die, DWTH212-13812LH Shop By Category > Hand Tools>Seal Installers Drill America DWRRSS1-1/8 1-1/8" HSSDrill America DWTH212 13812LH 1 3 8" 12 2 1 2" OD HSS Left Hand Round Adjustable Die, DWTH212 13812LH For threading, a High Speed Steel Round Adjustable Die is desired for improved wear life. Round Dies are chamfered on both faces. One side has a 2 to 3 thread chamfer for threading, the other side has a 1 to 1 1 2 thread chamfer for threading close to a shoulder. Adjustment is obtained by a fine pitch screw which forces the sides of the die apart, or