"C/O 1 ARBOR, 1 BUSHING DRILL JIG AND 4 CUTTER HEADS W/INSIDE DIAMETERS OF 0.930, 0.900, 0.880, AND 0.810, O/A DIMENSIONS 6 IN LG BY 2 IN DIA; CUTTER MATL HIGH CARBON STEEL; USED W/DRILLING MACHINE; RQRD TO CUT WELD BETWEEN PRESSURE SWITCH FLANGE AND CONTAINER FLANGE; SERD 490021"