1/2 inch square drive; tool is used to remove and install thread-in hydraulic check valves
No other part numbers with same form, fit, and function found.
NSN 5985-01-546-7570
NSN 5895-00-325-7392
NSN 6110-01-156-7524
NSN 5996-01-560-9455
NSN 7035-01-150-1917
NSN 6240-01-535-6101
NSN 5950-00-223-0444
NSN 5999-01-023-3158
NSN 5996-01-614-6669
NSN 6650-01-201-7591
NSN 5990-01-643-4167
NSN 5855-01-053-6782